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A small source of sound moves on a circl...

A small source of sound moves on a circle as shown in figure and an observer is sitting at O. Let `v_1,v_2,v_3` be the frequencies heard when the source is at A,B and C respectively.
.

A

`n_(1)gtn_(2)gtn_(3)`

B

`n_(2)gtn_(3)gtn_(1)`

C

`n_(1)=n_(2)=n_(3)`

D

`n_(2)gtn_(1)gtn_(3)`

Text Solution

Verified by Experts

The correct Answer is:
B
At point `A`, source is moving away from observer so apparent frequency `n_1 lt n` (actual frequency) At point `B` source is coming towards observer so apparent frequency `n_2 gt n` and point C source is moving perpendicular to observer so `n_3=n`.
Hence `n_2 lt n_3 gt n_1`.
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