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A car, moving at 110 mi/hr, passes a stationary police car whose siren has a frequency of 500 Hz. What is the frequency change heard

A car, moving at 110 mi/hr, passes a stationary police car whose siren has a frequency of 500 Hz. What is the frequency change heard by an observer in the moving car as he passes the police car? The velocity of sound in air is 343 m/s. (1 mi = 1.609 km) Answer in units of Hz. The answer is NOT 71.66 Hz

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