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A police cruiser is moving toward a stationary observer at 22.0 m/s. The frequency of the siren on the car is 750 Hz. What is

A police cruiser is moving toward a stationary observer at 22.0 m/s. The frequency of the siren on the car is 750 Hz. What is the frequency detected by the observer as the police cruiser approaches? Assume the speed of sound to be 342 m/s. a. about 1020 Hz b. about 705 Hz c. about 802 Hz d. about 750 Hz

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