The Rydberg equation for the hydrogen atom is given by (1/λ) = RH (1/nf^2 - 1/ni^2)
Where RH is the hydrogenic Rydberg constant, 1.0974×10^7m^−1, nf and ni are the final and initial principal quantum numbers of the energy levels, respectively. (The transition is from ni to nf )
The Balmer series are emission lines associated with transitions ending at the n = 2 principal level.
What is the upper principal level that generates a transition at 656.3 nm?
(1nm=10^−9m)