Question

Explain Doppler's effect in sound. Obtain an expression for apparent frequency of sound wave when source moves toward stationary listener.

Answer 1

Heya,

You wanted to know the dopplers effect so I'm here to help you!

____________________________

Let's unlock the answer of the question!

_______________________________

The effect, where there is a change in frequency and wavelength, is called the Doppler effect.

_______________

  Just a Random  Example:-

______________________________________________________

Suppose the listener is moving towards a stationary source of sound. The speed of the listener is VO. Let the source emits sound waves of frequency u and wave length equal to l .

We know that: l = V/u --------(1) Several wave crests separated by equal distance l are spread in all directions. The waves approaching the moving listener have a speed of propagation relative motion to the listener will be (V + VO).

Thus the frequency as heard by the listener is u' 

_________________________Kindly refer to the attachment

Hope it helps!

__________

Answer 2

hère is your answer mate....

The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.It is named after the Austrian physicist Christian Doppler, who described the phenomenon in 1842.