Consider only transitions involving the n = 1 through n = 4 energy levels for the hydrogen atom (using the diagram below).
a. How many emission lines are possible, considering only the four quantum levels?
b. Photons of the lowest energy are emitted in a transition from the level with n = to a level with n = .
c. The emission line having the shortest wavelength corresponds to a transition from the level with n = to the level with n = .