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A stationary ambulance has stopped at an intersection. The ambulance's siren emits a 628-Hz sound but...

A stationary ambulance has stopped at an intersection. The ambulance's siren emits a 628-Hz sound but the driver of a car moving away from the ambulance hears a 595-Hz sound. What is the speed of the car?

More than 16 m/s.

Between 10 m/s and 12 m/s.

Between 12 m/s and 14 m/s.

Less than 8 m/s.

Between 14 m/s and 16 m/s.

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Answer #1

we know that the frqvency heared by observor is deppand on its own velocity by given relation

Moving observer, stationary source Stationary source 0 Moving observer Observer moving towards stationary source will perceivwhere f0 is observed freqvency

fs is freqvency of sond emitted by source

V0 is velocity of observor

V is velocity of sound =330 m/s

given that

f0 =595 Hz

fs = 628 Hz

on putting in equation

595=628(1-V0/330)

V0 =330[1 - 595/628]

V0 =17.340 m/s ans

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