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A boy blowing a whistle of frequency f0 ...

A boy blowing a whistle of frequency f_0 is walking directly away from a wall at `1 ms^(-1)` towards his stationary friend. If his friend hears 4 beats per second and speed of sound is `340 ms^(-1)`, find approximate value of f_0.

A

`600 Hz`

B

`500 Hz`

C

`560 Hz`

D

`680 Hz`

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