The spectrum of a galaxy is observed to have an H$\alpha$ emission line at a wavelength of 928.7 nm.What is its redshift? (Note that the rest wavelength of the H$\alpha$ emission line is 656.3 nm.)

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The Answer of The spectrum of a galaxy is observed to have an H$\alpha$ emission line at a wavelength of 928.7 nm.What is its redshift? (Note that the rest wavelength of the H$\alpha$ emission line is 656.3 nm.)

The Spectrum of a Galaxy Is Observed to Have an H