The spectrum of a galaxy is observed to have a hydrogen emission line,normally found at 656.3 nm,with a measured wavelength of 928.7 nm.What is its redshift?

Name: The spectrum of a galaxy is observed to have a hydrogen emission line,normally found at 656.3 nm,with a measured wavelength of 928.7 nm.What is its redshift?
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The spectrum of a galaxy is observed to have a hydrogen emission line,normally found at 656.3 nm,with a measured wavelength of 928.7 nm.What is its redshift?

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The Answer of The spectrum of a galaxy is observed to have a hydrogen emission line,normally found at 656.3 nm,with a measured wavelength of 928.7 nm.What is its redshift?

The Spectrum of a Galaxy Is Observed to Have a Hydrogen