One of the wavelengths of light emitted by hydrogen atoms


One of the wavelengths of light emitted by hydrogen atoms under normal laboratory conditions is at ?0 = 656.3nm in the red portion of the electromagnetic spectrum. In the light emitted from a distant galaxy this same spectral line is observed to be Doppler-shifted to ? = 953.3nm , in the infrared portion of the spectrum.

How fast are the emitting atoms moving relative to the earth?

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Physics: One of the wavelengths of light emitted by hydrogen atoms
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