A) the source and the observer are moving in the same direction
B) the source and the observer are both at rest
C) there is a relative motion between the source and the observer
D) there is a resultant motion between the source and observer
Correct Answer: C
Solution :
According to Doppler's effect, when a source of sound or an observer or both are in motion relative to air, there is an apparent change in the frequency of sound as heard by the observer.
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