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Two identical tuning forks vibrating at ...

Two identical tuning forks vibrating at the same frequency 256 Hz are kept fixed at some distance apart. A listener runs between the forks at a speed of `3.0 m s^-1` so that he approaches one tuning-fork and recedes from the other. find the beat frequency bserved by the listener. Speed of sound in air `= 332 m s^-1`.
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