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
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(80)
Let original frequency is f by the concept of Doppler effect frequency of reflected wave
F' = 
, f' – f = 6, 
f – f = 6
⇒ f = 
= 80 Hz
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