Q. An particle with a kinetic energy of makes a head on collision with a hydrogen atom moving towards it with a kinetic energy of . The collision:

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A

must be perfectly elastic

B

may be perfectly inelastic

C

may be inelastic

D

must be perfectly inelastic

Solution:

Total momentum of system is hence maximum possible energy loss can be out of which can be absorbed hence option (C) is correct. For completely inelastic collision both come to rest after collision
and net energy of is lost. But electron in ground state of -atom can accept only an energy of . Hence the collision maybe inelastic but it can never be perfectly inelastic.

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4. Muon is a negatively charged particle with a mass me, where me 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.
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(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 times more than that of an hydrogen atom.
(D) The momentum of the muon in the orbit is times more than that of the electron.

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