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An observer is moving along positive x -...

An observer is moving along positive x -axis from the origin. One tuning fork moves away from the observer while other moves towards it at the same speed and with same natural frequency f. The velocity of sound in air is V. If observer hears the beat of frequency `f_(0)` find the speed of the tuning fork moving away from observer relative to the observer (Assume that both source and observe move at speed much less than the speed of sound )

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