The negative muon has a charge equal to that of an electron but a mass that is

Question:

The negative muon has a charge equal to that of an electron but a mass that is 207 times as great. Consider hydrogen like atom consisting of a proton and a muon.
(a) What is the reduced mass of the atom?
(b) What is the ground-level energy (in electron volts)?
(c) What is the wavelength of the radiation emitted in the transition from the n = 2 level to the n = 1 level?