| 单词 | electromagnetic wave |
| 例句 | Anechoic chambers are rooms designed to eliminate reflection and noises caused by electromagnetic waves. Sex in trees 2021-10-23T04:00:00Z The “millimeter wave” machines, which are considered less risky because they do not use X-rays, bounce electromagnetic waves off the body to produce a similar image. Practical Traveler: Are Scanners Worth the Risk? 2010-09-07T21:50:00Z Power lines, appliances and home wiring all emit electromagnetic waves, measured in gausses, which equal one ten-thousandth of a tesla. “Is there an afterlife?” Ghost-hunting at my grandmother’s house 2014-02-02T11:59:00Z Popular treatments include a salt-float bath and calming red-light therapy, as well as beds that use sounds and electromagnetic waves, which are said to put the body into a deep resting state. 6 Wellness Retreats That Promise High-Tech Healing 2023-03-07T05:00:00Z The episode ends with Chuck heading outside to retrieve files from his brother’s car, apparently forgetting his aversion to electromagnetic waves. 'Better Call Saul' Recap: What Kind of Show Is This? 2015-03-23T04:00:00Z For example, Wright has invited science lecturers from the local community college, State University of New York, Sullivan, to use the Turrell to teach about light and give public talks on photons and electromagnetic waves. Catskill Art Space Opens With James Turrell and a Lofty Vision 2022-10-19T04:00:00Z Albert Einstein's theory of relativity has long established that the trajectory of electromagnetic waves -- including light and terahertz electromagnetic waves -- can be deflected by gravitational fields. Photonic crystals bend light as though it were under the influence of gravity 2023-10-16T04:00:00Z Millimeter wave radars send fast-moving electromagnetic waves to targets to analyze their movement, position and speed from the waves bounced back. 'Impossible' millimeter wave sensor has wide potential 2023-10-02T04:00:00Z The French agency said the iPhone 12 recently failed one of two types of tests for electromagnetic waves capable of being absorbed by the body. Apple will update iPhone 12 in France after regulators said it emitted too much radiation 2023-09-15T04:00:00Z Radiation is energy that well, radiates – heat, light, and electromagnetic waves are all examples. She Cracked the Mystery of How to Split the Atom, But Someone Else Got the Nobel Prize for the Discovery 2023-09-07T04:00:00Z Other potential uses include the employment of nanomaterials to manipulate light and electromagnetic waves. Study warns Chinese nanotechnology fueling advanced bio, cyber weapons, electronic warfare tools 2023-08-26T04:00:00Z Meanwhile, the demodulator is an equal opportunity listener, translating whatever electromagnetic waves are present. Climate change is threatening the future of AM radio in the automobile | Tom Philp 2023-07-24T04:00:00Z Astronomers have mapped the sky using much of the spectrum of electromagnetic waves, from microwaves to visible light and γ-rays. Are Telescopes on the Moon Doomed? 2023-03-09T05:00:00Z With this new X-ray measuring device, the astronomers could calculate the star's polarization, meaning the direction and angle through which its electromagnetic waves are moving. A weird, dead magnetized star has a solid surface — and a ring 2023-01-09T05:00:00Z The problem involves the electromagnetic waves that are used with most conventional antennas, like those in cell phones, to transmit and receive data. Tiny ‘Rover’ Explores Cells without Harming Them 2022-11-21T05:00:00Z Metamaterials can be featured on the walls and windows of smart buildings to control and route electromagnetic waves at will. Engineered Metamaterials Can Trick Light and Sound into Mind-Bending Behavior 2022-11-18T05:00:00Z But electromagnetic waves come in all sizes, from the shortest wavelengths, and the highest frequencies — powerful gamma rays and X-rays — through ultraviolet, visible, infrared, microwaves and, finally, low-frequency radio waves. Maarten Schmidt, Caltech astronomer who changed our understanding of the cosmos, dies 2022-09-23T04:00:00Z Figure 24.2 The electromagnetic waves sent and received by this 50-foot radar dish antenna at Kennedy Space Center in Florida are not visible, but help track expendable launch vehicles with high-definition imagery. College Physics for AP Courses 2015-08-12T00:00:00Z As Maxwell showed, electromagnetic waves consist of an electric field oscillating in step with a perpendicular magnetic field, both of which are perpendicular to the direction of travel. Chemistry 2019-02-14T00:00:00Z In a Nature Communications paper, they describe a new antenna design that can operate safely inside cells by resonating with acoustic rather than electromagnetic waves. Tiny ‘Rover’ Explores Cells without Harming Them 2022-11-21T05:00:00Z Scientists have determined that the best way to communicate with any intelligent civilizations out there is by using electromagnetic waves, and radio waves seem best suited to the task. Astronomy 2016-10-13T00:00:00Z The Italian inventor Guglielmo Marconi used theoretical discoveries about electromagnetic waves to create the first radio in 1895. World History: Patterns of Interaction 2012-01-01T00:00:00Z This loop also had a gap across which sparks were generated, giving solid evidence that electromagnetic waves had been received. College Physics for AP Courses 2015-08-12T00:00:00Z Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. Chemistry 2019-02-14T00:00:00Z The key difference between a conventional antenna and the Cell Rover is the translation of electromagnetic waves into acoustic waves. Tiny ‘Rover’ Explores Cells without Harming Them 2022-11-21T05:00:00Z All electromagnetic waves longer than microwaves are called radio waves, but this is so broad a category that we generally divide it into several subsections. Astronomy 2016-10-13T00:00:00Z In 2010, he accepted a professorship at Shanghai Jiao Tong University to study “water memory,” claiming to have found evidence that DNA could be “teleported” through electromagnetic waves picked up by water. Luc Montagnier, Nobel-winning virologist who co-discovered HIV, dies at 89 2022-02-10T05:00:00Z Figure 24.5 This long straight gray wire with an AC generator at its center becomes a broadcast antenna for electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z Using their own small receiver, Kassas and his team picked up these electromagnetic waves. Scientists create their own GPS by spying on internet satellites 2021-09-27T04:00:00Z Because the relationship between a wave’s wavelength and frequency also depends on its speed, sound waves and electromagnetic waves with the same wavelength will have different frequencies. Tiny ‘Rover’ Explores Cells without Harming Them 2022-11-21T05:00:00Z As it gets hotter, this object will radiate electromagnetic waves until absorption and radiation are in balance. Astronomy 2016-10-13T00:00:00Z But these diffract and broaden as they travel, as does light or any other electromagnetic wave. Future Astronauts Could Phone Home with Lasers 2021-03-16T04:00:00Z The electric and magnetic fields are closely related and propagate as an electromagnetic wave. College Physics for AP Courses 2015-08-12T00:00:00Z Refraction describes the bending of electromagnetic waves, including light and radio waves. Floating land, wall of water appear over Chesapeake Bay amid rare mirage 2021-03-15T04:00:00Z No electromagnetic waves at all, None of any type. The Warped Side of Our Universe 2020-10-30T04:00:00Z So when we look at the electromagnetic waves emitted, we find a broad range, or spectrum, of energies and wavelengths. Astronomy 2016-10-13T00:00:00Z Electronic devices that enable rectification are called diodes and are widely used to transform alternating current into direct current, protect electric circuits from excess voltage and detect electromagnetic waves. One-way supercurrent achieved in an electrically polar film 2020-08-18T04:00:00Z Figure 24.7 A part of the electromagnetic wave sent out from the antenna at one instant in time. College Physics for AP Courses 2015-08-12T00:00:00Z Their discovery will usher in multi-messenger astronomy based on both gravitational and electromagnetic waves emitted by the same sources, providing new insights about the central engines that power these transients. A Movie of the Evolving Universe, Potentially Scary 2020-08-02T04:00:00Z Billing itself as “a possible solution to COVID-19,” the Biotrimmer is a “quantum energy generator” that treats every cell in the human body simultaneously with electromagnetic waves in an “energy lock.” Don't fund me: The most questionable coronavirus crowdfunding ideas 2020-06-17T04:00:00Z For an electromagnetic wave to travel the distance of one of its wavelengths, λ, at the speed of light, c, we have c = λ/t. Astronomy 2016-10-13T00:00:00Z The walls of Saad's office at al-Aqsa University are covered with posters of Saturn's moons, electromagnetic waves, telescopes, and other, more far-off planets. In Gaza, scanning the sky for stars, not drones 2020-03-09T04:00:00Z An incoming electromagnetic wave accelerates electrons in the antenna, setting up a standing wave. College Physics for AP Courses 2015-08-12T00:00:00Z To determine that structure, her student Neil Sapra used a computer to simulate how different patterns would interact with incoming electromagnetic waves. New Particle Accelerator Fits on a Silicon Chip 2020-01-04T05:00:00Z Moreover, oscillating currents tend to radiate electromagnetic waves. The Exquisite Precision of Time Crystals 2019-10-16T04:00:00Z The big problem with trying to study such waves is that they are tremendously weaker than electromagnetic waves and correspondingly difficult to detect. Astronomy 2016-10-13T00:00:00Z He asked a nurse to replace the forceps with a tool called a vessel sealer, a device that emits electromagnetic waves in order to cut off blood flow, usually within seconds. Paging Dr. Robot 2019-09-23T04:00:00Z Give an example of resonance in the reception of electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z Tracking BAOs requires a 3D map of galaxies made by measuring their redshifts — the lengthening of the electromagnetic waves in their spectra of light. Dark energy mapper will reconstruct 11 billion years of cosmic history 2019-08-11T04:00:00Z They successfully sought temporary authority from the FCC to use the Educational Broadband Services spectrum - a sort of channel of electromagnetic waves - that wasn’t being used. Tribes across country push for better internet access 2019-05-14T04:00:00Z This was the first time that a gravitational wave event had been detected with any kind of electromagnetic wave. Astronomy 2016-10-13T00:00:00Z They successfully sought temporary authority from the FCC to use the Educational Broadband Services spectrum — a sort of channel of electromagnetic waves — that wasn’t being used. Tribes across country push for better internet access 2019-05-14T04:00:00Z Make a list of some everyday objects and decide whether they are transparent or opaque to each of the types of electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z To nail the case for the supposed mixed merger, astronomers would likely have to spot light and electromagnetic waves from it. Theorist calculates the incalculable siren song of merging black holes 2019-05-02T04:00:00Z On Titan, electromagnetic waves were sensed that could only be formed by bouncing around between two conductive layers, like, say, a bunch of salty water buried under Titan’s surface and a charged atmosphere. Could a Space Helicopter Find Life on Saturn's Moon Titan? 2019-02-22T05:00:00Z We already use a messenger—light or, more generally, electromagnetic waves—that moves through space at the fastest speed in the universe. Astronomy 2016-10-13T00:00:00Z Cassel makes the common assumption that radio or other electromagnetic waves would provide the first signs of other civilizations in our galaxy. Readers Respond to the September 2018 Issue 2018-12-29T05:00:00Z Give an example of energy carried by an electromagnetic wave. College Physics for AP Courses 2015-08-12T00:00:00Z Hertz subsequently became the first to demonstrate the existence of electromagnetic waves, which eventually led to the radio and to telecommunications. Helmholtz mentored many Nobelists 2018-12-04T05:00:00Z Hospital workers favour them as they do not emit electromagnetic waves, the Japan Times reports. Japan finally pulls the plug on pagers 2018-12-04T05:00:00Z Let’s see how we can denote the differences among the whole broad family of electromagnetic waves. Astronomy 2016-10-13T00:00:00Z Such properties include colour, time variability, polarization and phase — the offset of an electromagnetic wave from a given position. A glimpse into the heart of a quasar 2018-11-27T05:00:00Z Different names are used for electromagnetic waves of different wavelengths: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. College Physics for AP Courses 2015-08-12T00:00:00Z These differ from terrestrial radiation sources in that they are high-energy particles rather than electromagnetic waves, e.g., x-rays. Surgery in Space: Medicine's Final Frontier 2018-10-12T04:00:00Z In conventional accelerators, particles are propelled by electromagnetic waves that are produced by external circuits. Short proton bunches rapidly accelerate energetic electrons 2018-09-18T04:00:00Z Astronomers, with the use of current technology and computing power, have learned to time the arrival of electromagnetic waves coming from space very precisely at each telescope and combine the data later. Astronomy 2016-10-13T00:00:00Z The Linux Kernel, transistors, electromagnetic waves and Game Theory were discussed in detail. The secret to four siblings accepted to Ivy League? A love of books 2018-09-07T04:00:00Z However, electromagnetic waves also have some unique properties compared to other waves. College Physics for AP Courses 2015-08-12T00:00:00Z This deft primer by astrophysicist James Geach captures the elusive electromagnetic wave in five processes. Ode to a tiny porpoise, a kaleidoscopic tour of light, and a visit to the fossil market: Books in brief 2018-09-03T04:00:00Z Physicians use electromagnetic waves to “see” internal structures like bones without needing to open up a human patient to view them directly. Where the Pacific Northwest's "Big One" Is More Likely to Strike 2018-08-05T04:00:00Z The energy of a photon is connected to the frequency of the electromagnetic wave it represents by Planck’s formula, E = hf. Astronomy 2016-10-13T00:00:00Z This sounds similar to the way that changes in electric and magnetic fields generate each other to produce a propagating electromagnetic wave. Readers Respond to the April 2018 Issue 2018-08-03T04:00:00Z For propagation, mechanical waves require a medium, while electromagnetic waves do not require a physical medium. College Physics for AP Courses 2015-08-12T00:00:00Z The process is similar to how a radio translates electromagnetic waves into music. Before Its Death Dive, Cassini Caught Saturn Hissing at Its Rings 2018-08-01T04:00:00Z These satellites use what’s called a synthetic aperture radar, which beams electromagnetic waves down to Earth and then measures the reflected light, according to the National Oceanic and Atmospheric Administration. Nuclear Bomb Test Moved North Korea Mountain 2018-05-14T04:00:00Z Have your group make a list of all the electromagnetic wave technology you use during a typical day. Astronomy 2016-10-13T00:00:00Z Vision, for example, is based on our sensitivity to light: electromagnetic waves that lie within a specific range of frequencies. What Is Dark Matter? 2018-05-08T04:00:00Z The prediction of electromagnetic waves is one of the most spectacular examples of this power. College Physics for AP Courses 2015-08-12T00:00:00Z Masers, which were conceived in the 1950s, and lasers, which followed in 1960, generate intense beams of highly ordered electromagnetic waves. Diamond device paves way for first practical microwave lasers 2018-03-20T04:00:00Z But each wavelength of light was vibrating at a different angle, a telltale sign of an effect called Faraday rotation, in which a magnetic field twists the orientation of electromagnetic waves as they pass through. Magnetic Secrets of Mysterious Radio Bursts in a Faraway Galaxy 2018-01-10T05:00:00Z Like any electromagnetic wave, a laser beam contains an electric field that whips back and forth. Physicists are planning to build lasers so powerful they could rip apart empty space 2018-01-24T05:00:00Z These use electromagnetic waves to generate high-resolution images of unusual objects that might be concealed by passenger clothing; these anomalies are then superimposed on the image of a mannequin to protect privacy. Is That Airport Security Scanner Really Safe? 2017-12-18T05:00:00Z In fact, Maxwell concluded that light is an electromagnetic wave having such wavelengths that it can be detected by the eye. College Physics for AP Courses 2015-08-12T00:00:00Z They include a count from one to five, mathematical operations like addition and multiplication, simple trigonometry and a description of electromagnetic waves. How to send a message to another planet 2017-11-15T05:00:00Z Previously, scientists could only study space by observing electromagnetic waves such as radio waves, visible light, infrared light, X-rays and gamma rays. In first, scientists detect gravitational waves and light from star collision 2017-10-16T04:00:00Z The laser field would then shake the particles, causing them to emit electromagnetic waves—in this case, gamma rays. Physicists are planning to build lasers so powerful they could rip apart empty space 2018-01-24T05:00:00Z In that era of profound scientific change, apparently improbable ideas — such as evolution and the existence of electromagnetic waves — were suddenly central to the conversation. Fiction: The science in Sherlock Holmes : Nature : Nature Research 2017-09-19T04:00:00Z Starting in 1887, he performed a series of experiments that not only confirmed the existence of electromagnetic waves, but also verified that they travel at the speed of light. College Physics for AP Courses 2015-08-12T00:00:00Z You need electromagnetic waves if you want to reach across the Milky Way. Greetings, E.T. (Please Don’t Murder Us.) 2017-06-28T04:00:00Z Previously, scientists could only study space by observing electromagnetic waves such as radio waves, visible light, infrared light, X-rays and gamma rays. In first, scientists detect gravitational waves and light from star collision 2017-10-16T04:00:00Z Bioimaging researchers are manipulating light, sound and electromagnetic waves to minimize the two main effects that blur images: diffraction and scattering. Medical microbots need better imaging and control 2017-05-23T04:00:00Z “But in this case nature provides the conversion between electromagnetic waves and acoustic waves.” New theory may explain the ‘music of the meteors’ 2017-04-14T04:00:00Z High voltages induced across the gap in the loop produced sparks that were visible evidence of the current in the circuit and that helped generate electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z When these pulses are switched off, the protons realign and emit electromagnetic waves at a particular frequency. Quantum microscope offers MRI for molecules 2017-03-05T05:00:00Z When Hertz demonstrated the electromagnetic waves, radio waves, with a finite velocity, it ended the debate. Beyond fact-checking: After the catastrophic media failure of 2016, the press must master “crucial evidence” 2017-02-19T05:00:00Z The pseudoscience is extreme, not least in the work of electrical engineer Bernard Kazhinsky, who posited that humans are radio stations, and thoughts electromagnetic waves. Books in brief : Nature : Nature Research 2017-01-31T05:00:00Z The force these particles would carry should induce electromagnetic waves in the apparatus with a frequency of somewhere between a kilohertz and a gigahertz—in other words, radio waves. Searching for particles on a benchtop 2017-01-26T05:00:00Z An RLC circuit connected to the first loop caused sparks across a gap in the wire loop and generated electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z This leads atoms inside a painting to ionize and emit electromagnetic waves of their own. A Master Work, the Ghent Altarpiece, Reawakens Stroke by Stroke 2016-12-19T05:00:00Z Together, they will look for phenomena that emit both gravitational and electromagnetic waves, in what has been called the coming age of multimessenger astronomy. Nature’s 10 2016-12-18T05:00:00Z The facility is situated inside the 13,000 square-mile National Radio Quiet Zone, where interference from electromagnetic waves, like those emitted from phone towers and radio transmitters, is severely limited or blocked. For Sale: 123-Acre Mountain Retreat With a Secret Code Name 2016-10-31T04:00:00Z Finding what is under the surface is not as simple as shooting radar or electromagnetic waves into the ground, he said. As Donald Trump Calls for Wall on Mexican Border, Smugglers Dig Tunnels 2016-09-01T04:00:00Z Hertz also studied the reflection, refraction, and interference patterns of the electromagnetic waves he generated, verifying their wave character. College Physics for AP Courses 2015-08-12T00:00:00Z The Faraday cage, a metal construction which traps electromagnetic waves, is named after 19th Century British scientist Michael Faraday. Hove bar uses Faraday cage to block mobile phone signals - BBC News 2016-08-02T04:00:00Z Educated in England and Italy, Marconi decided at age 20 to study the electromagnetic waves predicted by James Clerk Maxwell in the 1860s and verified experimentally by German physicist Heinrich Hertz some 20 years later. Technology: Revolutionary of radio : Nature : Nature Research 2016-07-19T04:00:00Z Ham radio, or amateur radio, dates to the beginning of radio, when inventors such as Guglielmo Marconi were first unraveling the mystery of how electromagnetic waves travel through the atmosphere. Ham radio operators have annual Field Day 2016-07-09T04:00:00Z The researchers would then reposition their telescopes in the hopes of detecting visible light, or other electromagnetic waves, that originate from the same events that produce the gravitational waves. LIGO detects whispers of another black-hole merger 2016-06-14T04:00:00Z The dimensions of the antenna are critical for determining the frequency of the radiated electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z Mr. Alexis, a former sailor, left behind a document accusing the Navy of attacking his brain with “extremely low frequency” electromagnetic waves. United States of Paranoia: The World of Gang-Stalking 2016-06-10T04:00:00Z Their superposed states are delicate and the slightest intrusion from outside—a stray electromagnetic wave or a tiny change in temperature—can make those states vanish prematurely. Now try this 2016-05-05T04:00:00Z Residents of the nearby town of Niscemi complain that the electromagnetic waves produced by the dishes and antennae are dangerous to human beings. Why the U.S. Military's New Global Communications System Has Been Held Back By Protesters in Sicily 2016-03-17T04:00:00Z The relocations will "create a sound electromagnetic wave environment", the news agency cited regional official Li Yuecheng as saying. China to relocate 10,000 people to make way for telescope - BBC News 2016-02-16T05:00:00Z Some familiar phenomena are based on the production of electromagnetic waves by varying currents. College Physics for AP Courses 2015-08-12T00:00:00Z Everything we knew until now about the cosmos stemmed from electromagnetic waves such as radio waves, visible light, infrared light, X-rays and gamma rays. Einstein's gravitational waves detected in landmark discovery 2016-02-11T05:00:00Z Gravitational waves are emitted from accelerating mass analogous to the way electromagnetic waves are emitted from accelerating charge; both are emitted from accelerating matter. Gravitational Waves Discovered: Top Scientists Respond 2016-02-11T05:00:00Z Everything we know about the cosmos stems from electromagnetic waves such as radio waves, visible light, infrared light, X-rays and gamma rays. Einstein's gravitational waves detected in scientific milestone 2016-02-11T05:00:00Z People receiving the tumor-treating electromagnetic waves had to shave their scalp and wear the electrode-laced cap at least 18 hours a day, according to the study. Electromagnetic Waves May Help Fight Deadly Brain Cancer 2015-12-15T05:00:00Z Your microwave oven, for example, sends electromagnetic waves, called microwaves, from a concealed antenna that has an oscillating current imposed on it. College Physics for AP Courses 2015-08-12T00:00:00Z The scientists said that because gravitational waves are so radically different from electromagnetic waves they expect them to reveal big surprises about the universe. Einstein's gravitational waves detected in landmark discovery 2016-02-11T05:00:00Z "There's a whole spectrum of gravitational waves, just like there's a whole spectrum of electromagnetic waves," said astrophysicist Ira Thorpe of NASA's Goddard Space Flight Center. European satellite to test method to find ripples in space, time 2015-12-01T05:00:00Z There it was converted into electromagnetic waves, and in that moment on Oct. The First Time Speech Crossed the Atlantic Ocean 2015-10-22T04:00:00Z Patients experienced very few side effects from the electromagnetic wave treatment, with the most common being a rash from the electrode cap. Electromagnetic Waves May Help Fight Deadly Brain Cancer 2015-12-15T05:00:00Z They can be detected in electromagnetic waves, however, by taking advantage of the phenomenon of resonance, as Hertz did. College Physics for AP Courses 2015-08-12T00:00:00Z Physicists also understood electromagnetism — the theory of all electric and magnetic phenomena, including the properties of electromagnetic waves. Q&A: Boson beginnings : Nature : Nature Publishing Group 2015-10-20T04:00:00Z X-ray machines, TV and radio transmitters, mobile phones, WiFi and microwave ovens are all everyday sources of electromagnetic waves. Gadget 'allergy': French woman wins disability grant - BBC News 2015-08-27T04:00:00Z This type of wormhole would hide electromagnetic waves from view from the outside. Magnetic Wormhole Created in Lab 2015-08-21T04:00:00Z A tenth of a millisecond later, all of the materials that had made up the bomb converted into an ionized gas, and electromagnetic waves were released into the air. “Most of Nagasaki’s residents had no warning”: The day we dropped the bomb 2015-08-06T04:00:00Z A system with the same natural frequency as the electromagnetic wave can be made to oscillate. College Physics for AP Courses 2015-08-12T00:00:00Z The Defense Advanced Research Projects Agency attempted to design reliable detection technology using seismic and electromagnetic waves, to no avail. How El Chapo Builds His Tunnels 2015-08-03T04:00:00Z Translations of radio and electromagnetic waves from space into audible sound make for eerie listening. This Is What Pluto and the Universe May Sound Like 2015-07-17T04:00:00Z Atomic clocks track the frequency of electromagnetic waves emitted by atoms as they change energy states. Hyper-precise atomic clocks face off to redefine time 2015-06-01T04:00:00Z Michael McKean is so vulnerable as Chuck, a man of intellect and dignity reduced to fending off electromagnetic waves with a space blanket. In Episode 105, 'Better Call Saul' Shows Its Soft Spot 2015-03-03T05:00:00Z All radio and TV receivers use this principle to pick up and then amplify weak electromagnetic waves, while rejecting all others not at their resonant frequency. College Physics for AP Courses 2015-08-12T00:00:00Z Later, he studied radio astronomy, molecular structures and microwave spectroscopy as a means of controlling electromagnetic waves. Charles H. Townes, Physicist Who Helped Develop Lasers, Dies at 99 2015-01-28T05:00:00Z The Secret Service, the national laboratories, and Defense Department are working on counter-measures that would zap the electronic components of drones with electromagnetic waves or disrupt their radio commands. The Drone Threat May Be the Only Problem the Secret Service Is on Top Of 2015-01-26T05:00:00Z "It's possible that electromagnetic waves at some frequency will kill the waves produced by bacterial DNA." UNESCO to host meeting on controversial 'memory of water' research 2014-09-23T04:00:00Z Using radio telescopes including the Very Long Baseline Array, the US team exploited the physics of electromagnetic waves to operate the instruments as one giant, precise, Earth-sized telescope. Row reignites over distance of Pleiades star cluster 2014-08-27T04:00:00Z A brief overview of the production and utilization of electromagnetic waves is found in Table 24.1. College Physics for AP Courses 2015-08-12T00:00:00Z Light is describable as an electromagnetic wave and as a particle, a photon. A Bold Critic of the Big Bang’s "Smoking Gun" 2014-07-24T04:00:00Z For her “Sunken Gardens,” visitors donned headphones that amplified electromagnetic waves given off by induction loops hidden under Caramoor’s sprawling Sunken Garden. ‘In the Garden of Sonic Delights’ in Katonah 2014-07-18T04:00:00Z Everywhere in the modern world, the throb of alternating current generates electromagnetic waves — from the television, the blender, the light bulbs, the wires in the wall. Debate Continues on Hazards of Electromagnetic Waves 2014-07-07T04:00:00Z If light is polarized it means a majority of its component electromagnetic waves have an electric field that is oscillating along a certain direction as they travel towards the Earth. Blockbuster Big Bang Theory Under Scrutiny Due To... Dust Figure 24.10 The electromagnetic spectrum, showing the major categories of electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z Radiation from a flare is made up of nearly the entire range of electromagnetic waves, from the long to the short — radio waves, optical, x-rays and gamma rays — explains NASA. Burst of plasma from solar flare could glance Earth this Friday the 13th 2014-06-13T04:00:00Z How she accomplished discovery was by controlling something that surrounds us all the time — electromagnetic waves. Wirelessly Powering Medical Chips Inside Your Body 2014-05-26T04:00:00Z Faraday’s study of electricity led to some of the biggest discoveries and inventions in the history of mankind, ranging from the electric motor to the discovery of electromagnetic waves that surround just about everything. Creationists now losing their minds because Neil deGrasse Tyson explained electricity 2014-05-19T04:00:00Z It works on the idea that electromagnetic waves travel differently depending on the kind of material they encounter. Implant no bigger than a grain of rice is powered by wireless breakthrough 2014-05-19T04:00:00Z The name is applied to electromagnetic waves of similar frequencies regardless of source. College Physics for AP Courses 2015-08-12T00:00:00Z Researchers believe electromagnetic waves from major cities, stemming from electronic devices, disrupt the internal compasses of the birds, hampering their natural orientation skills. Birds Are Getting Lost Because of Our Gadgets, Claims Study 2014-05-09T09:39:52Z They nonetheless stir up electromagnetic waves within the droplet. Why the 'Venus Rainbow' Is Actually a Glory 2014-03-14T17:50:00Z The device was supposed to work by detecting electromagnetic waves "emanating from" the virus. Egyptian public sceptical about military’s HIV ‘breakthrough’ 2014-02-25T18:02:54Z An electromagnetic wave is not really like a wave on the ocean, but it is in many ways analogous to such a wave, and through such an analogy, it seems more comprehensible. Readers Respond to Physicists Debate Whether the World Is Made of Particles or Fields" 2013-11-24T13:15:00.487Z There are many uses for radio waves, and so the category is divided into many subcategories, including microwaves and those electromagnetic waves used for AM and FM radio, cellular telephones, and TV. College Physics for AP Courses 2015-08-12T00:00:00Z Otherwise, the electromagnetic waves disrupted the birds’ internal magnetic compasses, he says. Birds Are Getting Lost Because of Our Gadgets, Claims Study 2014-05-09T09:39:52Z "When you add material around an object to cloak it, you can't avoid the fact that you are adding matter, and that this matter still responds to electromagnetic waves," Prof Alu explained. New invisibility cloak type designed 2013-11-11T13:46:01Z Hertz ,through experimentation, proved that transverse free space electromagnetic waves can travel over some distance. And Let There Be "Molecules" of Light 2013-10-14T20:45:24.920Z His field of specialty was electromagnetic scintillation, which involves the transmission of electromagnetic waves through the atmosphere. Albert D. ‘Bud’ Wheelon, satellite pioneer, dies at 84 2013-10-01T23:33:47Z Anyone who has used a microwave oven knows there is energy in electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z The FBI said this week that Alexis believed electromagnetic waves had been controlling him for months before the rampage. Coroner releases body of Navy Yard gunman Aaron Alexis 2013-09-27T01:18:57Z The suits contain a fabric--interwoven with nickel, stainless steel, and aluminum--that blocks up to 90 percent of electromagnetic waves. 4 Global Innovations You Can't Miss 2013-06-27T19:00:00Z Stimulated emission is the process by which an an excited state interacts with an electromagnetic wave of a certain frequency. And Let There Be "Molecules" of Light 2013-10-14T20:45:24.920Z They learned about Hertz’s discovery of electromagnetic waves and Marconi’s experiments with wireless transmissions. Jhumpa Lahiri: “Brotherly Love.” 2013-06-03T04:00:00Z With electromagnetic waves, larger E -fields and B -fields exert larger forces and can do more work. College Physics for AP Courses 2015-08-12T00:00:00Z The principle of radar is simple: a device sends electromagnetic waves into the environment and then listens for echoes that would signify the presence of an object. Quantum Noise-Beating Technique with Entangled Photons Demonstrated for First Time 2013-04-05T17:45:02.510Z They work by detecting how molecules collectively resonate — like guitar strings that vibrate together — with electromagnetic waves of specific wavelengths. Diamond-Based Quantum Devices Shrink MRI to Nanoscale 2013-02-04T17:15:00.363Z An anechoic chamber for measuring sound or electromagnetic waves at the National Physical Laboratory in Teddington. 'Eight great technologies' benefit from £600m in government funding 2013-01-25T09:53:22Z At the most basic level, we don’t really perceive separate objects at all – we perceive our nervous systems’ responses to a boundless flow of electromagnetic waves and biochemical reactions. Meaning on the Brain: How Your Mind Organizes Reality 2012-12-26T16:45:02.780Z In electromagnetic waves, the amplitude is the maximum field strength of the electric and magnetic fields. College Physics for AP Courses 2015-08-12T00:00:00Z The no-photon interference effect arises because the fluctuations of the vacuum field, like the oscillations of more actual electromagnetic waves, are constrained by the cavity walls. Cavity Quantum Electrodynamics 2012-10-09T20:45:02.517Z Masers were borne of an idea first postulated by Albert Einstein: that in some materials, energy could be pumped in and concentrated into a beam of electromagnetic waves oscillating in synchrony. Cousin of laser is a hot prospect 2012-08-16T10:42:59Z But in the absence of knowledge about the specific nature of extraterrestrial civilizations, we need to explore all sources of communication possible and not just ones based on electromagnetic waves. Better (extraterrestrial) communication through chemistry: Isotopes and mirror-image molecules 2012-07-25T17:45:03.207Z Instruments in the “drill-string”—as formerly inflexible steel drill-shafts are now called—are meanwhile transmitting dozens of additional measurements: of the radioactivity of the surrounding rock, its resistivity to electromagnetic waves, and so on. Oilfield services: The unsung masters of the oil industry 2012-07-19T15:02:30Z Thus the energy carried and the intensity I of an electromagnetic wave is proportional to E 2 and B2 . College Physics for AP Courses 2015-08-12T00:00:00Z The same physical properties have also been shown to belong to electromagnetic waves excited by an electric discharge, whatever the frequency, thus including all kinds of aetherial radiation in the same category as light. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z When electromagnetic waves were discovered experimentally in 1888 by Heinrich Hertz, it was thus that he was able to demonstrate that they travelled with the velocity of light. Lord Kelvin An account of his scientific life and work 2012-04-06T02:00:32.097Z Megahertz are a measure of the frequency of electromagnetic waves such as radio. Australia Seeks A$3 Billion From Telstra, Optus Spectrum Sales 2012-02-10T03:55:01Z At any one moment these two effects are distributed periodically or cyclically through space, and these changes in time and space constitute an electric wave or electromagnetic wave. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Since the electric and magnetic fields in most electromagnetic waves are perpendicular to the direction in which the wave moves, it is ordinarily a transverse wave. College Physics for AP Courses 2015-08-12T00:00:00Z The most modern supposition regarding this matter, by Maxwell, is that light itself is founded on electricity, and that light waves are merely electromagnetic waves. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z According to Maxwell it is the speed of propagation of electromagnetic waves in an insulating medium for which the units are defined. Lord Kelvin An account of his scientific life and work 2012-04-06T02:00:32.097Z Then, when the car receives the radio waves, which are electromagnetic waves, the waves generate a current in a wire in the car, and this tells the car which direction to move in. Block Radio Waves 2011-12-22T15:15:00.253Z The number 3�1010 is the value in centimetres per second of the velocity of the electromagnetic wave, and is identical with that of light. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The electromagnetic spectrum is separated into many categories and subcategories, based on the frequency and wavelength, source, and uses of the electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z Acoustic modems--which use sound waves to transmit information--are one of the few viable methods for "wireless" communication in a medium that blocks or absorbs the electromagnetic waves we usually use. Dolphin Whistles Help Solve The Mysteries Of The Cosmos 2011-11-21T20:45:02.017Z Often incorporated into personal computers and gaming consoles, optical disk drives use laser light or electromagnetic waves to read and write data. Hitachi-LG Data to plead guilty to scheme to fix prices of optical drives, pay $21.1M fine 2011-09-30T18:26:46Z I will focus on the “easy” solutions, meaning the ones that appeal to the shared experience of a physical object, be it observing configurations of galaxies or interacting with the same electromagnetic waves. Galactic Challenge Part III: The "Easy" Solutions 2011-09-12T18:15:05.793Z Metamaterials are materials unavailable in nature, in which the microstructure is changed to create unusual properties such as bending of electromagnetic waves. Invisibility and 'emotive' robots 2011-07-08T22:46:43Z Any electromagnetic wave produced by currents in wires is classified as a radio wave, the lowest frequency electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z Lerosey and his colleagues took a similar approach to an experiment they performed in 2007 and later described theoretically for electromagnetic waves. Soft-Drink Cans Focus Sound Waves to a Point, Beating Diffraction Limit 2011-07-08T18:15:00.487Z Instead of delivering lectures, the new co-instructors conducted collaborative classes, in which students worked in teams to answer questions about electromagnetic waves. Improving the Science of Teaching Science 2011-05-12T19:19:18Z As the name suggests, electromagnetic waves propagating in space consist of oscillating electric and magnetic fields. Galactic Challenge Part III: The "Easy" Solutions 2011-09-12T18:15:05.793Z In some crystals and in Earth's atmosphere, for example, electromagnetic waves propagate differently in different directions, and may also, on entering the medium, be split into components that propagate differently. A bold unifying leap 2011-03-16T18:20:01.107Z In which situation shown in Figure 24.25 will the electromagnetic wave be more successful in inducing a current in the wire? College Physics for AP Courses 2015-08-12T00:00:00Z So it is natural to expect that an oscillating mass should give rise to gravitational waves just as an oscillating electric charge produces electromagnetic waves. Gravity, by George Gamow [Special Archive Article] 2011-03-04T13:45:00.433Z There is data showing that the human brain is sensitive to electromagnetic waves, whether we like it or not. Study: Cell Phones Cause Change in Brain Activity 2011-02-23T01:06:34Z Dr. Volkow said future research may even show that the electromagnetic waves emitted from cellphones could be used to stimulate the brain for therapeutic reasons. Well: Cellphone Use Tied to Changes in Brain Activity 2011-02-22T21:31:34Z Light consists of electromagnetic waves that oscillate perpendicular to the direction of the light's travel. Did Vikings navigate by polarized light? 2011-01-31T20:15:00.257Z In which situation shown in Figure 24.26 will the electromagnetic wave be more successful in inducing a current in the loop? College Physics for AP Courses 2015-08-12T00:00:00Z Are gravitational waves divided into discrete energy packets, or quanta, as electromagnetic waves are? Gravity, by George Gamow [Special Archive Article] 2011-03-04T13:45:00.433Z In experimenting with electromagnetic waves it is in general more difficult to measure the period of the oscillations than their wave length. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Many of these devices transmit a signal, and all of them emit electromagnetic waves, which, in theory, could interfere with the plane’s electronics. Itineraries: On a Phone, Interfering With Safety 2011-01-17T21:01:31Z Imaging techniques such as CAT scans and MRIs, in use since the early 1970s, detect the internal structure of patients by measuring electromagnetic waves scattered from them. Invisibility: After several years of research, it's just gotten weirder 2011-01-11T18:45:11.203Z Under what conditions might wires in a DC circuit emit electromagnetic waves? College Physics for AP Courses 2015-08-12T00:00:00Z In 2008, Mr. Long ordered an aerial survey of the region using Essex ground-penetrating radar, which transmitted electromagnetic waves from a P-3 Orion airplane flying 3,500 feet above the glacier. Racing Time and Nature to Find Aviators Entombed in a Glacier 2010-09-20T19:32:00Z It has 17 anechoic chambers, which block sound and electromagnetic waves. Live Blogging Apple's Discussion of iPhone 4 Problem 2010-07-16T17:39:00Z By the 1890s, Nikola Tesla had demonstrated that not just magnetic fields but also electromagnetic waves themselves could transmit power—and over far greater distances. Cutting the clutter 2010-03-12T09:45:00Z In order to have an electromagnetic wave, one must have a medium in which an electric field or a magnetic field may exist. Where I Wasn't Going Give an example of interference of electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z Omega's machines, utilizing atoms from everywhere, even the ether, split them by radio-activity through electromagnetic waves, and utilized the energy of their electrons which always move in fixed orbits. Omega, the Man In alternating layers of experiment and theory these three men built up the modern theory of electromagnetism, and demonstrated the identity of light with electromagnetic waves. Mysticism and Logic and Other Essays These people use an ancient system of electromagnetic wave propagation called frequency modulation, and once Lee and I rigged up a suitable transceiver the rest was simple. Control Group Page 374 In alternating layers of experiment and theory these three men built up the modern theory of electromagnetism, and demonstrated the identity of light with electromagnetic waves. Human Traits and their Social Significance The rate at which information can be transmitted on an electromagnetic wave is proportional to the frequency of the wave. College Physics for AP Courses 2015-08-12T00:00:00Z Sending forth electromagnetic waves it massed and directed the atmospheric pressure, sending heat waves here, cold ones there, thus causing droughts and rainfall at will. Omega, the Man Physics tells us that certain electromagnetic waves start from the sun, and reach our eyes after about eight minutes. Mysticism and Logic and Other Essays Maxwell and Hertz respectively predicted and produced electromagnetic waves long before Marconi applied this knowledge and developed "wireless" telegraphy. Artificial Light Its Influence upon Civilization Maxwell's theory thus establishes a close correlation between the phenomena of the luminous and those of the electromagnetic waves, or, we might even say, the complete identity of the two. The New Physics and Its Evolution Figure 27.4 A transverse wave, such as an electromagnetic wave like light, as viewed from above and from the side. College Physics for AP Courses 2015-08-12T00:00:00Z Later came the magnificent work of Hertz identifying the phenomena as "electromagnetic waves" in the ether, and developing a new world of theory and science based upon them and their production by disruptive discharges. Edison, His Life and Inventions By some elegant mathematics he had shown the probable existence of electromagnetic waves of radiation. The Dawn of Amateur Radio in the U.K. and Greece: a personal view Any luminous source such as the sun, a candle flame, or an incandescent lamp is sending forth electromagnetic waves not unlike those used in wireless telegraphy excepting that they are of much shorter wave-length. Artificial Light Its Influence upon Civilization The moment we look upon a wave in the ether as an electromagnetic wave, a molecule which emits light ought to be considered as a kind of excitant. The New Physics and Its Evolution An electromagnetic wave is composed of oscillating electric and magnetic fields. College Physics for AP Courses 2015-08-12T00:00:00Z It is nothing more or less than condensed sunlight, which in turn is simply electromagnetic waves; although it may take your scientists a good many centuries to reach that conclusion. The Lord of Death and the Queen of Life He generated and detected electromagnetic waves across the length of his laboratory on a wavelength of approximately one metre. The Dawn of Amateur Radio in the U.K. and Greece: a personal view The electromagnetic waves sent forth by a light-source like the sun are not all visible, that is, all of them do not arouse a sensation of light. Artificial Light Its Influence upon Civilization It absorbed and dissipated electromagnetic waves rather than reflecting them. The Lani People As we gain knowledge of the wave nature of electromagnetic waves and methods to analyze and interpret signals, new microscopes that enable us to “see” more are being developed. College Physics for AP Courses 2015-08-12T00:00:00Z The beauty of a coral reef, the warmth of sunshine, sunburn, an X-ray image revealing a broken bone, even microwave popcorn—all involve electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z To detect the electromagnetic waves Hertz employed a simple form of oscillator, which he termed a resonator. The Dawn of Amateur Radio in the U.K. and Greece: a personal view Even more intriguing is that all of these widely varied phenomena are different manifestations of the same thing—electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z As noted before, an electromagnetic wave has a frequency and a wavelength associated with it and travels at the speed of light, or c . College Physics for AP Courses 2015-08-12T00:00:00Z Visible light is the type of electromagnetic wave to which our eyes respond and has a wavelength in the range of 380 to 760 nm. College Physics for AP Courses 2015-08-12T00:00:00Z Thus, for all electromagnetic waves, the greater the frequency, the smaller the wavelength. College Physics for AP Courses 2015-08-12T00:00:00Z Many of the characteristics of the various types of electromagnetic waves are related to their frequencies and wavelengths, as we shall see. College Physics for AP Courses 2015-08-12T00:00:00Z We normally associate these properties with visible light, but they do apply to all electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z The most efficient length for a linear antenna, such as discussed in Production of Electromagnetic Waves, is λ / 2 , half the wavelength of the electromagnetic wave. College Physics for AP Courses 2015-08-12T00:00:00Z During his experiments that confirmed the existence of electromagnetic waves, Heinrich Hertz used a spark across a gap between two electrodes to provide the rapidly changing electric current that produced electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z Optics is the study of the behavior of visible light and other forms of electromagnetic waves. College Physics for AP Courses 2015-08-12T00:00:00Z But there is energy in an electromagnetic wave, whether it is absorbed or not. College Physics for AP Courses 2015-08-12T00:00:00Z Clearly, the larger the strength of the electric and magnetic fields, the more work they can do and the greater the energy the electromagnetic wave carries. College Physics for AP Courses 2015-08-12T00:00:00Z Furthermore, since these equations are based on the assumption that the electromagnetic waves are sinusoidal, peak intensity is twice the average; that is, I0 = 2Iave . College Physics for AP Courses 2015-08-12T00:00:00Z For propagation, mechanical waves require a medium, while electromagnetic waves do not require a physical medium. College Physics for AP Courses 2015-08-12T00:00:00Z Maxwell’s prediction of electromagnetic waves resulted from his formulation of a complete and symmetric theory of electricity and magnetism, known as Maxwell’s equations. College Physics for AP Courses 2015-08-12T00:00:00Z Find the intensity of an electromagnetic wave having a peak magnetic field strength of 4.00×10−9 T . College Physics for AP Courses 2015-08-12T00:00:00Z Lasers can be constructed that produce an extremely high intensity electromagnetic wave for a brief time—called pulsed lasers. College Physics for AP Courses 2015-08-12T00:00:00Z We know that visible light is the type of electromagnetic wave to which our eyes respond. College Physics for AP Courses 2015-08-12T00:00:00Z The waves on the strings of musical instruments are transverse—so are electromagnetic waves, such as visible light. College Physics for AP Courses 2015-08-12T00:00:00Z Photons are individual energy packets of electromagnetic waves, with Ephoton = hf, where h is Planck’s constant and f is the frequency of the associated light wave. College Physics for AP Courses 2015-08-12T00:00:00Z Microwave ovens use electromagnetic waves to heat food. College Physics for AP Courses 2015-08-12T00:00:00Z In contrast, dispersion of electromagnetic waves coming to us from outer space can be used to determine the amount of matter they pass through. College Physics for AP Courses 2015-08-12T00:00:00Z |
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