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A pedestrian standing on the sidewalk heard a frequency of 850 Hz when an ambulance is...

A pedestrian standing on the sidewalk heard a frequency of 850 Hz when an ambulance is travelling away from him with a speed of 45.0 m/s m / s . Speed of the sound in air = 343 m/s Part A What is the frequency of the ambulance's siren? Express your answer using three significant figures. Part B Then the ambulance stopped for a few seconds while sounding the siren. A driver in a car that is coming towards the ambulance heard a frequency of 995 Hz H z . What is the speed of the car? Express your answer using three significant figures.

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