Question

What is the expression of the droopler shift

Answer 1

vR = cΔf/(fS+ fO) Summary. The derivation of the Doppler Effect velocity equations starts with the general waveform and frequency equations. .

Answer 2

Answer:

The Apparent change in the frequency of sound when the source, the observer and the medium are in a relative motion is called Doppler Effect.

Let S be source of sound moving with velocity vs towards stationary listener O.

Distance travelled in time time period, T=vsT

Therefore apparent wavelength, λ′=λ−vs.T

If frequency is ν then,

λ=λ′−vsT

λ=λ′−νvs=νv−vs; v=νλ

If apparent frequency heard by listener is ν′

ν′=λ′v=v−vsνv

Thus apparent frequency is greater than the actual frequency as source moves towards listener. 

Similarly if source moves away from listener.

ν′=λ′v=v+vsνv