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Ambulance at rest produces a frequency of 500 Hz, from its horn. Now, Jon is driving...

Ambulance at rest produces a frequency of 500 Hz, from its horn. Now, Jon is driving his car, and the ambulance is following behind. Jon hears its horn at a frequency of 520 Hz. Which driver, if either, is driving faster?

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Answer #1

As the Apparent frequency(f'=520Hz) is greater than original frequency(f=500Hz) hence the relative motion between the Car and Ambulance is approching due to Doppler's effect.

This is only possible when Ambulance is moving at faster speed than car from behind.

Therefore the ambulance driver is driving faster than car

Refer to the formula of Doppler's effect

f'=f(V-Vo) /(V-Vs)

V=velocity of sound

Vo=velocity of observer

Vs=velocity of source

*take direction of velocity of sound from source to observer as positive otherwise negative.

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