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 spee

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 ms ^(-1)`
B. ` 2.5 ms ^(-1)`
C. ` 3.0 ms ^(-1)`
D. ` 3.5 ms ^(-1)`

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,

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