Question

A muon is a negatively-charged unstable elementary particle with a mass equal to 208 times that of the electron, and a charge equal to that of the electron. Although unstable, the muon does have a lifetime long enough for it to form a short-lived (muonic) atom, in which it plays the same role as an electron in an ordinary atom.

Suppose that a muon forms a muonic atom with a nucleus with (Z=13) and all electrons have been stripped from the atom. Calculate the radius of the n=94 orbit in the hydrogen-like muonic atom.

Answer 1