# 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 sour

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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. v_1gtv_2ltv_3
B. v_1=v_2gtv_3
C. v_2gtv_3gtv_1
D. v_1gtv_3gtv_2

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