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Q.

Two whistles A and B produces notes of frequencies 660 Hz and 596 Hz respectively. There is a listener at the mid-point of the line joining them. Now the whistle B and the listener start moving with speed 30 m/s away from the whistle A. If speed of sound be 330 m/s, how many beats will be heard by the listener

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a

2

b

4

c

6

d

8

answer is B.

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Detailed Solution

For observer note of B will not change due to zero relative motion.Observed frequency of sound produced by A= 660(330−30)330=600 Hz∴ No. of beats = 600 – 596 = 4
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Two whistles A and B produces notes of frequencies 660 Hz and 596 Hz respectively. There is a listener at the mid-point of the line joining them. Now the whistle B and the listener start moving with speed 30 m/s away from the whistle A. If speed of sound be 330 m/s, how many beats will be heard by the listener