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1. The frequency heard by a stationary person when the siren of a police car approaches him is 825 Hz and the frequency heard

1. The frequency heard by a stationary person when the siren of a police car approaches him is 825 Hz and the frequency heard when the police car moves away from him is 745 Hz. The speed of sound is 343 m/s. A) What is the speed of the police car? B) What is the frequency of the siren as heard by the cop driving the police car?

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