what is doppler effect

The aperant change in frequancy of wave motion due to the relative motion of listner and source this is called Doppler effect.

 

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Doppler Effect can be defined as the increase or decrease in the frequency of sound or light or any other waves as the source or observer moves towards ( away from ) each other.This effect makes a sudden change in pitch noticeable in a passing syren as well as by the Red shift seen by the astronomers .

          Actually it was stated by Austrian Physicist Christia Doppler in 1842 in Prague,Capital of Czec Republic.

DOPPLER EFFECT ;

Doppler effect is the change in frequency or wavelength of a wave for an observer who is moving relative to the wave source.