First slide

Doppler's effect

Question

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

Easy

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

Solution

Since there is no relative motion between the listener and source, hence actual frequency will be heard by listener.

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