While standing at a crosswalk,you hear a frequency of 600 Hz from an approaching police car.After the police car passes,its frequency is 400 Hz.What is the speed of the police car? (speed of sound = 340 m/s)
A)34.0 m/s
B)60.0 m/s
C)66.3 m/s
D)68.0 m/s
E)199 m/s

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The Answer of While standing at a crosswalk,you hear a frequency of 600 Hz from an approaching police car.After the police car passes,its frequency is 400 Hz.What is the speed of the police car? (speed of sound = 340 m/s)
A)34.0 m/s
B)60.0 m/s
C)66.3 m/s
D)68.0 m/s
E)199 m/s

While Standing at a Crosswalk,you Hear a Frequency of 600