Question

A car moves at 20 m/s north. An ambulance passes it going 25 m/s north, with its siren on, f = 500 Hz. Find the frequency heard in the car when the ambulance is moving away. (The speed of sound in air is 343 m/s)

Answer #1

When source is is moving away from observer and observer approaching source

f" = (V+Vo)/(V+Vs) *f

Where, vs = Velocity of the Source,

vo =
Velocity of the Observer,

v =
Velocity of sound or light in medium,

f =
Real frequency,

f' =
Apparent frequency.

=>f" =(343+20)/(343+25)*500 = **493.20Hz**

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