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Question

A train moving towards a tunnel in a huge mountain with a speed of 12 m/s sounds its whistle. Sound is reflected from the mountain. If the driver hears 6 beats per second & speed of sound in air is 332 m/s, the frequency of the whistle is

A
80 Hz
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B
120 Hz
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C
160 Hz
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D
240 Hz
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Solution

The correct option is A 80 Hz

So, the answer will be 80Hz(A).


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