Differentiate between blueshift and redshift?
✍• A blueshift is any decrease in wavelength (increase in energy), with a corresponding increase in frequency, of an electromagnetic wave; the opposite effect is referred to as redshift. In visible light, this shifts the color from the red end of the spectrum to the blue end.
✍• Is that blueshift is (physics) a change in the wavelength of light, in which the wavelength is shorter than when it was emitted at the source while redshift is (physics) a change in the wavelength of light, in which the wavelength is longer than when it was emitted at the source.
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