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Two sources A and B are sounding notes of frequency 680 Hz. A listener moves from A to B with a constant velocity u. If the speed of sound is 340 m/s, What must be the value of u so that he hears 10 beats per second?

A

`2.0 m-s^(-1)`

B

`2.5m-s^(-1)`

C

`3.0m-s^(-1)`

D

`3.5m-s^(-1)`

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The correct Answer is:
B
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