While Standing at the Roadside Waiting for Your Ride You

While standing at the roadside waiting for your ride you hear a frequency of 540 Hz from the siren of an approaching ambulance.After the ambulance passes,the observed frequency of the siren drops to 450 Hz.Take the speed of sound in air 340 m/s.The speed of the ambulance is

A) 62 m/s.
B) 51 m/s.
C) 44 m/s.
D) 31 m/s.
E) 19 m/s.

Correct Answer:

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