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A stationary source S is producing sound...

A stationary source `S` is producing sound, of frequency `f` and an observer `0` is at, rest at some distance from source.A reflector is moving with constant speed , v along perpendicular bisector of line joining source and observer.The (most appropriate) variation of beat frequency registered by observer will be Reflector is moving from `-oo` to `+oo` along perpendicular bisector

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