A) the source and the observer are moving: in 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: A
Solution :
According to Dopplers 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. Drift velocity,
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