If a beam of blue light has a wavelength of 400 nm is emitted by an object moving away from you at 1% of the speed of light,what wavelength would you see from this light?

Question

Quizplus · Accepted Answer

The correct answer is A because the wavelength of light is shortened when the object is moving away from the observer. The amount of shortening is proportional to the speed of the object. In this case, the object is moving away from the observer at 1% of the speed of light, so the wavelength of the light will be shortened by 1%. This means that the wavelength of the light will be 400 nm * (1 - 0.01) = 396 nm.

If a Beam of Blue Light Has a Wavelength of 400