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Q.

A table is rotating about its axis at the rate of 5 rotations per second. A source of sound of frequency 103 Hz is fixed at a distance 0 . 7 m from its axis. If the velocity of sound is 352 m/s, then the difference of apparent frequencies heard by an observer standing infront of the table, will be

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a

120 Hz

b

125Hz

c

250Hz

d

500Hz

answer is B.

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Detailed Solution

We know that Δn=2nωrV ∴ Δn=2×103×(2×3⋅14×5)×0⋅7352=125Hz
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A table is rotating about its axis at the rate of 5 rotations per second. A source of sound of frequency 103 Hz is fixed at a distance 0 . 7 m from its axis. If the velocity of sound is 352 m/s, then the difference of apparent frequencies heard by an observer standing infront of the table, will be