Before the formation of the molecule it is possible for the muonic hydrogen atom to be formed in an excited state and for radiation to be observed from a single transition to the ground state. Calculate the lowest frequency of the radiation that could be observed in this process and estimate the momentum of the recoiling atom.
Muonic Hydrogen is 207 heavier than normal Hydrogen
To find the highest frequency I would use E=hf and solve for E_2 - E_1=hf , because this is the biggest gap. I don't even have a clue on how to start this question