A proton and a negatively charged meson (called a muon) can form a short-lived species called

A proton and a negatively charged μ meson (called a muon) can form a short-lived species called a mesonic atom. The charge of a muon is the same as that on an electron and the mass of a muon is 207 me. Assume that the Bohr theory can be applied to such a mesonic atom and calculate the ground-state energy, the radius of the first Bohr orbit, and the energy and frequency associated with the n = 1 to n = 2 transition in a mesonic atom.