(Answered) In hydrogewn the transition from level 2 to level 1 has a

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In hydrogewn, the transition from level 2 to level 1 has a rest wavelength of 121.6nm. Suppose you see this emission or absorption at a wavelength of 121.9 nm in Star C and 122.9 nm in Star D. Calculate each's star's speed, and state whether it is moving toward or away from you.

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