A Doppler effect occurs when a source of sound moves
A)toward you.
B)away from you.
C)either
D)neither

Question

Quizplus · Accepted Answer

The Doppler effect occurs when there is relative motion between the source of the sound and the observer. This motion can be either towards or away from the observer, so both A and B would be correct. Therefore, the best choice is C, which includes both options. D is not correct because there must be some relative motion for the Doppler effect to occur.

A Doppler Effect Occurs When a Source of Sound Moves