1. The problem statement, all variables and given/known data A wavelenght of 410.2*10^-9m is emitted by the hydrogen atom in a high voltage discharge tube. what are the initial and final values of the quantum number n for the energy lvl transition that produces this wavelength? 2. Relevant equations 1/(lambda) = R * (1/2^2 - 1/n^2): Lyman series? 3. The attempt at a solution I have used this equation to figure out (lambda) but never the other way around. I tried to solve for n but it dosnt make sense. How can I know which series to solve n for? At first I thought that it had to be Lyman as Z=1 for hydrogen and subsequently n=1 but no. The answer is ni = 6 and nf = 2.