In hydrogen, the transition from level 2 to level 1 has a rest wavelength of 121.6 nm. Suppose you see this line at a wavelength of 120.5 nm in Star A and 121.2 in Star B. Calculate each stars speed, and state whether or not it is moving toward or away from you.
Please help me with this and be as detailed as possible in your explanation, so I can do it by myself in the future. Thank you very much.
Please help me with this and be as detailed as possible in your explanation, so I can do it by myself in the future. Thank you very much.