A) motion of source
B) motion of observer
C) relative motion of source and observer
D) none of the above
Correct Answer: C
Solution :
According to Doppler's effect, when a sound source fixed at a place produces sound, an observer standing at a distance listens sound of the same frequency as produced by the source. If however the sound source or observer or both are in the state of motion, then the frequency of the sound appears changed to the observer. If, as a result of motion the distance between the source and observer is decreasing, then the frequency of the source appears to be increased to the observer. On the other hand, if the distance between them is increasing, the frequency appears to be decreased to the observer. Hence, Doppler's effect is due to relative motion between source and observer.
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