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Question: the h transition in hydrogen has a rest wavelength...

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The H α transition in hydrogen has a rest wavelength of 656.3 nm, coming from electrons moving between the n=2 and n=3 orbitals. You observe a star in which this transition shows a wavelength of 650 nm. How fast is the star moving? Is it moving toward you or away from you. Calculate the same for a galaxy where the wavelength of H α is 1100 nm.

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