Q.

A table is revolving on its axis at 5 revolutions per second. A sound source of frequency 1000 Hz is flxed on the table at 70 cm from the axis. The minimum frequency heard by a listener standing at a distance from the table will be (speed of sound = 352 m/s)

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a

1000 Hz

b

1066 Hz

c

941 Hz

d

352 Hz

answer is C.

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Detailed Solution

For source vS = rω = 0.70×2π×5 = 22 m/secMinimum frequency is heard when the source is receding the man. It is given by nmin = nvv+vs1000×352352+22 = 941 Hz
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