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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)gtn_(3)`

D

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

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B
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