Two sources A and B are sounding notes of frequency 700 Hz. A listener moves from A to B with constant velocity u. If the speed of sound is 350 m/s, what must be the value of u so that 8 beat/s are heard ?

# Two sources A and B are sounding notes of frequency 700 Hz. A listener moves from A to B with constant velocity u. If the speed of sound is 350 m/s, what must be the value of u so that 8 beat/s are heard ?

1. A

2 m/s

2. B

1.5 m/s

3. C

2.5 m/s

4. D

4 m/s

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