JEE Main 2018 Physics question
Muon () is negatively charged () with a mass , where is the mass of the electron and e is the electronic charge. If is bound to a proton to form a hydrogen like atom, identify the correct statements - (a) Radius of the muonic orbit is 200 times smaller than that of the electron (b) the speed of the in the orbit is times that of the electron in the orbit (c) The ionization energy of muonic atom is 200 times more than that of an hydrogen atom (d) The momentum of the muon in the orbit is 200 times more than that of the electron
Answer: (D)
Solution
The source prints "20 times" in statement (d); the key (D) requires 200 times (speed is mass-independent, so ).