posted by Anonymous .
What electron transition in a hydrogen atom, ending in the orbit 5, will produce light of wavelength 3040 ?
3040 what? angstroms. Whatever it is convert to meters. You say ENDING in orbit 5 so I assume that means it starts further out.
(1/wavelength) = R*(1/25 - 1/x^2)
R = 1.09737E7