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A police car's siren has a certain pitch. In which of these cases will the pitch of the sound observed to be higher? A. thecar

A police car's siren has a certain pitch. In which of these cases will the pitch of the sound observed to be higher? A. thecar is moving towards the observer B. the car is moving away from the observer C. the observer is moving away from the car D. the car and observer are stationary

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