A sound source \( S \) is moving along a straight track with speed \( v \), and is emitting soun...

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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 \( \mathrm{O} \), from the track. The time variation of frequency heard by the observer is best represented by ( \( \mathrm{t}_{0} \) represents the instant when the distance between the source and observer is minimum)
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