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A car, moving at 180 mi/hr, passes a station- ary police car whose siren has a frequency of 500 Hz. What is the frequency change

A car, moving at 180 mi/hr, passes a station- ary 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

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