Answer to Question #33971 in Acoustics for Steven

Question #33971
A police car is racing to the scene of an accident. A student waiting at a bus stop notes that the pitch of the siren is 1100 Hz as the car approaches her ad then shifts to 900 Hz as the car continues past her toward the accident. Using her knowledge of the Doppler effect, what did she determine the speed of the police car was?
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