An He+ ion has one electron , just as a hydrogen atom does , but has two protons in its nucleus instead of just one .
a) Find a formula for the wavelength lambda of an emission line for this ion in terms of the magnitude of the hydrogen ground-state energy lE1l=13.6eV , n initial, and n final.
b)show that all transitions to n=5 from n>=12 produce visible emission lines, and find the limiting wavelength of this series of lines as n-->infinity (?).
c) there are nine other emission lines less within the visible region (700 nm to 400 nm) . find wavelengths of these nine lines?