Question

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

Answer 1

Answer:

It is called Doppler's effect of sound.

Explanation:

When there is a relative motion between the source of sound and the observer, then there is some change in the frequency of sound heard by the observer. This phenomenon is called Doppler's effect of sound.

Let v be the velocity of sound, vs be the speed of source and vo be the speed of observer and f be the original frequency. Then the apparent frequency heard by the observer is given by

$f'=\left ( \frac{v-v_{0}}{v-v_{s}} \right )\times f$

here, the observer and the source both are moving in rightwards direction.

Answer 2

when observer and source moves relative to each other then the frequency received by the observer is different from the real frequency

This apparent change in frequency due to relative motion is known as Doppler's effect.

Here we know that

$f_{app} = f_o\frac{v\pm v_o}{v \pm v_s}$

here we know that

$f_o$ = real frequency

v = speed of sound

$v_o$ = speed of observer

$v_s$ = speed of source

so this is known as Doppler's Effect