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Q.

A man sitting in a moving train hears the whistle of the engine. The frequency of the whistle is 600 Hz

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a

The apparent frequency as heard by him is smaller than 600 Hz

b

The apparent frequency is larger than 600 Hz

c

The frequency as heard by him is 600 Hz

d

None of the above

answer is C.

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Detailed Solution

Since there is no relative motion between the listener and source, hence actual frequency will be heard by listener.
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A man sitting in a moving train hears the whistle of the engine. The frequency of the whistle is 600 Hz