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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 v₁, v₂, v₃ be the frequencies heard when the source is at A, B and C respectively

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v₁ > v₂ > v₃

v₁ = v₂ > v₃

v₂ > v₃ > v₁

v₁ > v₃ > v₂

answer is C.

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Detailed Solution

At B, direction of velocity of source is towards the observer, so frequency is highest.

At A, direction of velocity of source is away from the observer, so frequency is lowest.

At C, direction of velocity of source is perpendicular to line joining the observer, so frequency is same.

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