Doppler Effect

A man sitting on a swing which is moving to an angle of $60°$ from the vertical is blowing a whistle which has a frequency of$2.0 \mathrm{k} \mathrm{Hz}$. The whistle is $2.0 \mathrm{m}$ from the fixed support point of the swing. A sound detector which detects the whistle sound is kept in front of the swing. If velocity of sound in air is $330 \mathrm{m}/\mathrm{s}$, then the maximum frequency the sound detector detected is

Police in a siren car moving with a velocity $20 m{s}^{-1}$ chases a thief who is moving in a car with a velocity $v_{0}m{s}^{-1}$. The police car sounds at frequency $300Hz$, and both of them move towards a stationary siren of frequency $400Hz$. Calculate the speed at which the thief is moving. (Assume the thief does not observe any beat)

What is meant by the Doppler effect? Discuss the case
Both are in motion- Observer chases Source

What is meant by the Doppler effect? Discuss the case
Both are in motion- Source chases Observer

What is meant by the Doppler effect? Discuss the case
Both are in motion- Source and Observer resides from each other

What is meant by the Doppler effect? Discuss the case
Both are in motion- Source and Observer approach each other.

What is meant by the Doppler effect? Discuss the case
An observer in motion and Source at rest- Observer resides away from the Source.

What is meant by the Doppler effect? Discuss the case
An observer in motion and Source at rest- Observer moves towards Source.

What is meant by the Doppler effect? Discuss the case
Source in motion and Observer at rest- Source moves away from the observer
 

What is meant by the Doppler effect? Discuss the case
Source in motion and Observer at rest- Source moves towards observer

Explain red shift and blue shift in Doppler effect.

Explain the Doppler effect.