| 单词 | Doppler effect |
| 例句 | Or the red shift might be a Doppler effect due not to the general expansion of the universe but rather to a more modest and local galactic explosion. Cosmos 1980-01-01T00:00:00Z The discovery of the Big Bang and the recession of the galaxies came from a commonplace of nature called the Doppler effect. Cosmos 1980-01-01T00:00:00Z The most obvious explanation of the red shift was in terms of the Doppler effect: the galaxies were receding from us; the more distant the galaxy the greater its speed of recession. Cosmos 1980-01-01T00:00:00Z There is nevertheless a nagging suspicion among some astronomers that all may not be right with the deduction, from the red shifts of galaxies via the Doppler effect, that the universe is expanding. Cosmos 1980-01-01T00:00:00Z The Doppler effect is the key to cosmology. explosions, that produced any particular sample of magnesium. Cosmos 1980-01-01T00:00:00Z We can determine the present rate of expansion by measuring the velocities at which other galaxies are moving away from us, using the Doppler effect. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z This is the Doppler effect, and it works with light, too. Zero: The Biography of a Dangerous Idea 2000-02-07T00:00:00Z The only way to clock the speed of a galaxy is by using the Doppler effect—the same principle used in state troopers’ radar guns. Zero: The Biography of a Dangerous Idea 2000-02-07T00:00:00Z This red shift, observed in the spectral lines of distant galaxies and interpreted as a Doppler effect, is the key to cosmology. Cosmos 1980-01-01T00:00:00Z The Demerol had set off some kind of weird Doppler effect in my head, like the whine of car tires speeding past and receding in the distance. The Secret History 1992-10-16T00:00:00Z This relationship between wavelength and speed, which is called the Doppler effect, is an everyday experience. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z To understand the implications of this, we must first understand the Doppler effect. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z The apparent recession of the galaxies, with the red shift interpreted through the Doppler effect, is not the only evidence for the Big Bang. Cosmos 1980-01-01T00:00:00Z Indeed, the police make use of the Doppler effect to measure the speed of cars by measuring the wavelength of pulses of radio waves reflected off them. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z The book rings louder in my imagination the more time I spend apart from it, a kind of reverse Doppler effect. ‘Dying: A Memoir’ Is a Bracing Illumination of Terminal Illness 2017-07-26T04:00:00Z “We extract those and maybe do a little Doppler effect on them.” The Carpetbagger: 'War Horse' Sound Tricks: Otters Stand in for Horses and Other Trade Secrets 2012-01-03T19:51:11Z With Alice Coltrane-like harp runs, meditation bowls, rave stabs and Doppler effect dub wobbles, he creates music full of surprises that is always melodic. Caribou: Swim 2010-04-17T23:10:00Z There were stray samples of hip-hop, salsa and Top 40 coming from car radios, getting transposed downward by the Doppler effect as they faded away. The Art of Summer: The Contrapuntal Sounds of Gridlock 2011-08-09T23:37:12Z The boys cheered the cornfields while I experienced the Doppler effect of being passed by a massive long-haul truck going roughly 80 mph. A latecomer to the #vanlife party takes a 4,000-mile road trip in a pop-up camper 2021-09-23T04:00:00Z Christos Hatzis' "Coming To" featured very high harmonics and sliding passages in thirds that sounded like the Doppler effect of a passing train. Hahn, Lisitsa mix old, new with dazzling results 2011-10-18T18:26:04Z It’s got a story that skips around in time, so there’s a moral Doppler effect to factor in. Phil Klay’s New Novel Is a Sobering Look at America’s Wars 2020-09-28T04:00:00Z The track “Run for Your Life” is made of multiple beats recorded from a moving van — Diggs’s raps change tempo to account for the Doppler effect. 2020 Is Chaotic. Clipping’s New Horror-Rap Album Captures It. 2020-10-19T04:00:00Z Sometimes I go to sleep to the bizarre Doppler effect of planes that sound as if they’re about to crash into my house. Sea-Tac Airport: Push back on impact on neighbors 2023-06-09T04:00:00Z They emit light at specific wavelengths, which the gases’ swirling motion smears into “broad emission lines” through the Doppler effect. Astronomers try to catch titanic black hole clashes in action 2023-04-25T04:00:00Z The characteristic sound of a motorcycle buzzing by is an example of the Doppler effect. College Physics for AP Courses 2015-08-12T00:00:00Z The Doppler effect lets astronomers measure the star’s radial velocity: that is, the speed of the star, toward us or away from us, relative to the observer. Astronomy 2016-10-13T00:00:00Z The red shift is a consequence of the Doppler effect. Physical Geology 2015-01-01T00:00:00Z This animation demonstrates how the Doppler effect is heard as a car moves. An Introduction to Geology 2017-01-01T00:00:00Z As a satellite moves relative to a stationary observer, the waves of its signals compress and elongate, like the siren of a passing ambulance, in what’s known as the Doppler effect. Scientists create their own GPS by spying on internet satellites 2021-09-27T04:00:00Z This concept, known as the Doppler effect, supports Essential Knowledge 6.B.5. College Physics for AP Courses 2015-08-12T00:00:00Z Broadening of spectral lines by the Doppler effect is a measure of rotational velocity. Astronomy 2016-10-13T00:00:00Z Before we get to the Doppler effect as it pertains to the red shift, let’s see how it works on something more tangible. Physical Geology 2015-01-01T00:00:00Z The Doppler effect is the same process that changes the pitch of the sound of an approaching car or ambulance from high to low as it passes. An Introduction to Geology 2017-01-01T00:00:00Z This Doppler effect is illustrated by the whistle of an approaching train. The Future of Car Navigation Has Arrived 2021-02-25T05:00:00Z What happens to the relativistic Doppler effect when relative velocity is zero? College Physics for AP Courses 2015-08-12T00:00:00Z The Doppler effect is then used to measure radial velocities of the orbiting material and so derive the speed with which it moves around. Astronomy 2016-10-13T00:00:00Z And that gives astronomers a way to find them, using the Doppler effect. Who Really Discovered the First Exoplanet? 2019-11-12T05:00:00Z The Doppler effect is used on light emitted from stars and galaxies to determine their speed and direction of travel. An Introduction to Geology 2017-01-01T00:00:00Z Mueller studies bat behaviors, including their adaptations to the Doppler effect or Doppler shift. In the Wiggle of an Ear, a Surprising Insight into Bat Sonar 2019-06-17T04:00:00Z Is the relativistic Doppler effect consistent with the classical Doppler effect in the respect that λobs is larger for motion away? College Physics for AP Courses 2015-08-12T00:00:00Z Explain how the Doppler effect works for sound waves and give some familiar examples. Astronomy 2016-10-13T00:00:00Z That’s because the star moves in all three dimensions, but the Doppler effect only arises from one of those dimensions: the motion toward or away from the observer. Who Really Discovered the First Exoplanet? 2019-11-12T05:00:00Z Those washes of Moog are like the Doppler effect from a passing supersonic train. Giorgio Moroder – his 20 greatest songs, ranked 2019-03-28T04:00:00Z The second, called the relativistic transverse Doppler effect—predicted by Einstein’s earlier theory of special relativity—is a redshift that occurs when an object is moving tangentially to the line of sight. Star’s black hole encounter puts Einstein’s theory of gravity to the test 2018-07-26T04:00:00Z The Doppler effect is an alteration in the observed frequency of a sound due to motion of either the source or the observer. College Physics for AP Courses 2015-08-12T00:00:00Z We measure the speeds of the stars from the Doppler effect. Astronomy 2016-10-13T00:00:00Z American viewers were fully geeking out over the series — undeterred by its smarty-pants leads and references to the Doppler effect and projectile motion. What the remarkable run of 'Big Bang Theory' means for Hollywood — and the show's cast and crew 2018-05-04T04:00:00Z Using this technique, the scientists at La Silla sorted through night after night of observations of the star Ross 128, looking for evidence of a Doppler effect. There’s a new planet in the neighborhood — and it looks like a nice place to live 2017-11-15T05:00:00Z Assuming a much narrower bandwidth, and manually subtracting the Doppler effect, they recalibrated their signal. The Loyal Engineers Steering NASA’s Voyager Probes Across the Universe 2017-08-03T04:00:00Z He wanted to use satellites to teach his pupils about the Doppler effect, one of his former pupils Michael Sinnett said. Kettering Cosmos: How school children exposed Soviet secret - BBC News 2016-04-15T04:00:00Z The expansion and contraction of pulsating variables can be measured by using the Doppler effect. Astronomy 2016-10-13T00:00:00Z "It's like the Doppler effect only more so," said Prof Hardcastle. Black hole's twin jets shine bright, somehow - BBC News 2016-02-02T05:00:00Z The distant rumbling of his wheels created a Doppler effect as he shot around a corner in a full roar of skate wheels on pavement. Slamming the cement slopes 2015-10-31T04:00:00Z Based on the Doppler effect, Doppler radar is very similar to the type of radar used in the military to detect incoming planes and missiles. Why Is the Weather So Hard to Predict? 2015-10-07T04:00:00Z During a recent lesson on the Doppler effect, Scarlet slalomed among the legs of students who variously patted her passing head or ignored her. Dogs in classrooms? At these private schools, pets are all over the place. 2015-10-01T04:00:00Z The second would be to use the Doppler effect to look for changes in its velocity. Astronomy 2016-10-13T00:00:00Z The conversations are sprinkled with talk about vibrations per second, friction, tensile strength, absorption, Doppler effect and torque. The keys of life: Lexington piano tuner has perfect pitch 2015-06-07T04:00:00Z Blighter’s approach, based on a radar developed to spot human intruders who are crawling along the ground to evade detection, employs the Doppler effect instead. Copping a ’copter 2015-04-30T04:00:00Z That's the Doppler effect — when a wave changes relative to an observer, because the source is moving. Interstellar's fake black holes are helping actual scientific research 2015-02-16T05:00:00Z The amazing thing was that she didn’t even slow down — she just marched past me, still screaming — her voice fading with the Doppler effect. Every Time I Take My Baby Outside Somebody Yells at Me 2014-10-06T04:00:00Z Such motion can be measured using the Doppler effect and the star’s spectrum. Astronomy 2016-10-13T00:00:00Z He can discuss the uncertainty principal, calculus, the Doppler effect and relativity in an almost nonstop manner. Savage beating transformed Tacoma man into geometry marvel 2014-05-31T04:00:00Z The Doppler effect means the beam’s frequency rises when it bounces off an approaching object and falls when it returns from a receding one. Copping a ’copter 2015-04-30T04:00:00Z This is the famous Doppler effect, which acts to "stretch" or "compress" radio waves emanating from moving objects. Cutting-edge methods in MH370 search 2014-03-24T18:24:55Z As the blood cells move, the pitch of their reflected sound waves changes – dubbed the Doppler effect. Harvard Medical Student's 4-In-1 Blood-Flow-Reading Glove Targets $12 Billion Opportunity 2013-10-18T11:44:00Z The first successful use of the Doppler effect to find a planet around another star was in 1995. Astronomy 2016-10-13T00:00:00Z They are caused by the Doppler effect, a phenomenon familiar on Earth as the change in pitch of a police-car or ambulance siren as the vehicle approaches and then recedes. Dark energy: A problem of cosmic proportions 2013-08-22T15:00:06Z I recall hearing a couple of gunshots fired in the air, followed by a dead silence, and the loud racist and bloodthirsty slogans receding, as if a demonstration of the Doppler effect. India Ink: Thomas Bernhard in New Delhi 2013-07-22T13:05:57Z Using wi-fi signals to monitor movements without a sensor or camera, the system is founded on the Doppler effect. With a Wave of Your Hand 2013-06-10T20:10:55Z A slight shift in the frequency, because of the Doppler effect, means its speed and direction can be measured too. Low-cost radar: A programme worth watching 2013-03-14T16:06:58Z The general principle, now known as the Doppler effect, is illustrated in Figure 5.22. Astronomy 2016-10-13T00:00:00Z The light is shifted in frequency because of the Doppler effect, indicating that the light-emitting particles are moving fast. Newly Published Einstein Writings Show the Prehistory of His Debates with Niels Bohr [Guest Blog] 2013-02-21T17:45:00.450Z At the Nürburgring on Sunday, as Lewis Hamilton took the chequered flag, there was a shift in this position, McLaren creating their own Doppler effect, as they sped past. Martin Whitmarsh: McLaren and Ferrari can put brakes on Red Bulls 2011-07-25T23:01:04Z The Doppler effect arises as the material swirls around the disk at thousands of kilometers per second. Some supermassive black holes may not be so super after all 2011-02-18T21:45:02.483Z Because of the Doppler effect, the frequency of light reflected by ions that are moving towards the laser will be higher than that of light reflected by ions that are moving away from the laser. Measuring small things: The force is weak with this one 2010-04-22T10:36:00Z We can see from this illustration that the Doppler effect is produced only by a motion toward or away from the observer, a motion called radial velocity. Astronomy 2016-10-13T00:00:00Z Stark has shown that in many gases, notably hydrogen, the spectrum shows the Doppler effect, and he has been able to calculate in this way the velocity of the positive rays. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" And I noticed that the waves of sound were under a slight Doppler effect. Astounding Stories of Super-Science, August 1930 The radio beam swept through, ghostly faint from dispersion, wave length doubled by Doppler effect, ragged with cosmic noise. The Burning Bridge Since we were approaching them at twenty thousand times the speed of light, the Doppler effect gives us what looks like violet light. Islands of Space You may have heard the Doppler effect with sound waves. Astronomy 2016-10-13T00:00:00Z This shift is known as the Doppler effect and can be used to measure the radial velocities of distant objects. Astronomy 2016-10-13T00:00:00Z How many applications of the Doppler effect can your group think of in everyday life? Astronomy 2016-10-13T00:00:00Z What kind of motion for a star does not produce a Doppler effect? Astronomy 2016-10-13T00:00:00Z Measurements of line shifts produced by the Doppler effect indicate the radial velocity of a star. Astronomy 2016-10-13T00:00:00Z Because the Doppler effect was first used with visible light in astronomy, the terms “ blueshift” and “ redshift” became well established. Astronomy 2016-10-13T00:00:00Z |
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