Question

How does redshift differ from blueshift?

Answer 1

Hint: The redshift and blue shift is observed in the doppler shift. Doppler shift is also known as Doppler’s effect. It can be defined as the change in the frequency of the wave in the relation to an observer which is moving relative to the wave source.

Complete step by step solution:

S. No.	Red shift	Blue shift
(I)	Red shift is the displacement of spectral lines towards the longer wavelengths that is the red end of the spectrum in radiation from the distant galaxies and the celestial objects.	Blue shift is the displacement of spectral lines towards the shorter wavelengths that is the blue end of the spectrum in radiation from the distant galaxies and the celestial objects.
(II)	A blue shift is any increase in wavelength with the corresponding decrease in the frequency of an electromagnetic wave.	A blue shift is any decrease in wavelength with the corresponding increase in the frequency of an electromagnetic wave.
(III)	The value of the redshift is denoted by letter z corresponding to the change in the wavelength which is positive.	The value of the blue shift is corresponding to the change in the wavelength which is negative.

Note :
Similar effect is observed when the galaxy moves away its light is more stretched and it moves to the red end of the spectrum which is known as the redshift. Similarly when the galaxy moves towards us its light is compressed and becomes bluer which is known as blueshift.