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A sound source 'S' is moving along a straight track with the speed v, and is emitting sound of frequency \nu _{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 observer is best represented. (E _{0} represents the instant when the distance between the source and the observer is minimum:-  
Option: 1
Option: 2
Option: 3
Option: 4

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