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A sound source S is moving along a strai...

A sound source S is moving along a straight track with speed v, and is emitting sound of frequency `v_0` (see figure). An observer is standing at a finite distance at the point O, from the track . The time variation of frequency heard by the observer is best respresent by :
(`t_0` represents the instant when the distance between the source and observer is minimum )

A

Option1

B

Option2

C

Option3

D

Option4

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