Which of these are effects of the Doppler shift?
A) When an object is moving toward us, the wavelengths of its light decrease.
B) When an object is moving away from us, the frequencies of its light increases.
C) When an object accelerates, the wavelengths of its light get warmer.
D) When an object slows, the wavelengths of its light get cooler.

Question

Quizplus · Accepted Answer

The Doppler shift causes the wavelengths of light to decrease (blue shift) when an object is moving toward us, and increase (red shift) when moving away.

Which of These Are Effects of the Doppler Shift