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A man standing near a railway line hears...

A man standing near a railway line hears the whistle of an engine, which has a velocity of `20 ms^(-1)` What frequency does the man hear , when the engine is coming towards and going away from him, if the true frequency of the whistle is 1000 Hz.Speed of sound in air =`340 ms^(-1)`.

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Verified by Experts

The correct Answer is:
1062.5 Hz, 944.4 Hz
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