To find the energy needed to jump from one state to another we just need to subtract the initial state energy to the final state. In this case the final state will have -13.6 eV of energy and the initial state has -122.4 eV of eneregy, then we have:
[tex]-13.6-(-122.4)=108.8[/tex]
Therefore, the energy needed is 108.8 eV
