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Notes on doppler effect for students

Doppler effect is the apparent change in frequency when there is a relative motion between the source and the observe.


As the source approaches

formula for source moves toward observer

As the source moves away or recedes

formula for source moves away from observer

V is the speed of sound

Vs is the sped of the source

Fs is the frequency of the source

F’ is the observed frequency by the stationary observer

The Doppler effect for electromagnetic waves such as light is of great use in astronomy and results in either a so-called redshift or blueshift. It has been used to measure the speed at which stars and galaxies are approaching or receding from us; that is, their radial velocities.

Red and blue shift

As the star moves away from the earth there will be increase in wavelength and decrease in frequency, this is redshift

As the star moves away towards the earth the wavelength will decrease and frequency will increase, this is blueshift

View the video on Doppler effect below

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