Explain Doppler effect in sound. Derive the expression for the apparent frequency of sound when the source and listener are
i) approaching each other.
ii) moving away from each other.

Doppler's effect in sound takes place when source and observer are

The frequency of sound reaching a stationery listener behind a moving source is

In Doppler effect source,observer both are moves away from each other,Appearent frequency heared by observer is

Two cars are approaching each other on a straight road and moving with a velocity of 30 kmh-1 . If the sound produced in a car is of frequency 500 Hz, what will be the frequency of sound as heard by the person sitting in the other car ? When the two cars have crossed each other and are moving away from each other, what will be the frequency of sound as heard by the same person ? Speed of sound= 330 ms^-1 .

A source moves away from an obeserver with a certain speed, and the ratio of actual to the apparent frequency as heard by the observer in eta . If the two approach each other with the same speed, then find the ratio.