While Standing at a Crosswalk,you Hear a Frequency of 560

question 37

Multiple Choice

While standing at a crosswalk,you hear a frequency of 560 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)21.1 m/s
• D)26.2 m/s

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