The engine of a train moving with speed 10 ms^-1 towards a platform sounds a whistle at frequency 400 Hz. The frequency heard by a passenger inside the train is: (neglect air speed. Speed of sound in air = 330 ms^-1)

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200 Hz

400 Hz

388 Hz

412 Hz

answer is B.

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Detailed Solution

There is no change in frequency of sound for an observer inside the source. So he hears the actual frequency because no relative motion between the source and the observer.

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