The change in the frequency of a wave due to the motion of the source (or observer) is known as
A) the Mach effect.
B) the Bell effect.
C) interference.
D) the Doppler effect.
E) diffraction.

Question

Quizplus · Accepted Answer

The Doppler effect describes the change in frequency of a wave in relation to an observer who is moving relative to the wave source. It is commonly observed with sound waves, but it also applies to electromagnetic waves such as light.

The Change in the Frequency of a Wave Due to the Motion