The Doppler effect causes light from an object moving away from Earth to reach us at a lower frequency than it had when it was emitted.

Question

Quizplus · Accepted Answer

This statement is true. The Doppler effect applies to all types of waves, including light, and causes the wavelength of light from a moving object to appear longer (shifted towards the red end of the spectrum) when it is moving away from us, resulting in a lower frequency.

The Doppler Effect Causes Light from an Object Moving Away