Explain red and blue shift.

Red shift:

When the source is receding away from the observer, then the frequency of light appears to be decreasing or the wavelength of light appears to be increasing to the observer. Therefore, the spectral line gets displaced towards red end, hence it is known as the red shift.

Blue shift:

When the source is approaching the observer, then the frequency of light appears to be increasing or wavelength appears to be decreasing, i.e., the spectral line in electromagnetic spectrum gets displaced towards violet end, hence it is known as blue shift.

Explain the applications of Doppler effect of light in astronomical physics.

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