A muon of charge -e and mass m = 207me (where me is the mass of an

Question:

A muon of charge -e and mass m = 207me (where me is the mass of an electron) orbits the nucleus of a singly ionized helium atom (He+). Assuming that the Bohr model of the hydrogen atom can be applied to this muon-helium system, verify that the energy levels of the system are given by