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A police car, whose siren has a natural frequency of400Hz, moves away from a wall and towards a stationary observer at a speed of65km/h. What

A police car, whose siren has a natural frequency of400Hz, moves away from a wall and towards a stationary observer at a speed of65km/h. What is the beat frequency perceived by the observer? Hz If the observer stands between the car and the wall, what beat frequency does he perceive? Hz Take the speed of sound to be 343m/s.

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