A muon is a particle with a charge equal to that of an electron and a mass equal to 207 times the mass of an electron. When your prof was an undergrad, she worked on an experiment that made muonic atoms. These are atoms where a muon (rather than an electron) is captured by a proton. What would be the radius of the muonic atom second Bohr orbit and compare it to that of a hydrogen atom? What would be the shortest wavelength in the Balmer series for this muonic atom?