[Solved] While Standing at a Crosswalk, You Hear a Frequency of 540

Question 65
Multiple Choice

While standing at a crosswalk, you hear a frequency of 540 Hz from an approaching police car. After the police car passes, its frequency is 480 Hz. What is the speed of the police car? (speed of sound = 340 m/s)

A) 13.1 m/s
B) 17.4 m/s
C) 20.0 m/s
D) 26.2 m/s

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