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

A small source of sound moves on a circle as shown in the figure and an observer is standing on O. Let `n_1`,`n_2` and `n_3` be the frequencies heard when the source is at A, B and C respectively. Then

`n_(1) gt n_(2) gt n_(3)`

`n_(2) gt n_(3) lt n_(1)`

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

`n_(2) gt n_(1) gt n_(3)`

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