That's because the energy of light is tied to its wavelength.

因为光的能量与波长有关。

Their indirect effects can nonetheless be measured when their existence has been confirmed by a small shift call the lamb shift, which they produce in the spectrum energy of light from excited hydrogen atoms.

然而 当它们的存在被称为兰姆位移的小位移证实时 它们的间接影响就可以测量出来 兰姆位移是它们在激发氢原子的光谱能量中产生的。