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A man is standing on a railway platform listening to the whistle of an engine that passes the man at constant speed without stopping. If the engine passes the man at time `t_0` How does the frequency `f` of the whistle as heard by the man changes with time.

A

B

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D

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Verified by Experts

The correct Answer is:
A
Approach, `f' gt f`, Recession, `f' lt f`
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