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If a source sounding a whistle with a co...

If a source sounding a whistle with a constant frequency moves in a circle and frequencies observed by observer O, when the source is at points A, B, C be `v_(a)`, v_(b)`, `v_(c)`,then

A

`v_(a) gtv_(b)gtv_(c)`

B

`v_(a)=V_(c)ltv_(b)ltv_(c)`

C

`a_(a)=v_(c)gtv_(b)`

D

none of the above

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A
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