One of the strongest emission lines observed from distant galaxies comes from hydrogen and has a wavelength of 122 nm (in the ultraviolet region). How fast must a galaxy be moving away from us in order for that line to be observed in the visible region at 366 nm?

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of the strongest emission lines observed from distant galaxies comes from hydrogen and has a wavelength of 122 nm
(in the ultraviolet region). How fast must a galaxy be moving away from us in order for that line to be observed in the
visible region at 366 nm?
Transcribed Image Text:One of the strongest emission lines observed from distant galaxies comes from hydrogen and has a wavelength of 122 nm (in the ultraviolet region). How fast must a galaxy be moving away from us in order for that line to be observed in the visible region at 366 nm?
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