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Q.

Two sources of sound $S_{1}$ and $S_{2}$ produce sound waves of same frequency 660Hz. A listener is moving from source $S_{1}$ towards $S_{2}$ with a constant speed $u m / s$ and he hears 10 beats/s. The velocity of sound is 330m/s. Then, u is equal to

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a

10.0 m/s

b

15 m/s

c

2.5 m/s

d

5.5 m/s

answer is A.

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Detailed Solution

Number of beats $= \frac{2 n V_{o}}{V_{s o u n d}}$

$V_{o} = 2.5 m / s$

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