An electron of energy `11.2 eV` undergoes an inelastic collision with a hydrogen atom in its ground state [Neglect recoiling of atom as `m_(H) gt gt m_(e)]`. Then is this case

Options

A. the outgoing electron ha senergy `11.2 eV`
B. the entireenergy is absorbed by the `H` atom and the electron stops
C. `10.2 eV` of the incident electron energy is obsorbed by the `H` atom and the electron would come out with `1.0 eV` energy
D. none of the above

Answer

C

Explanation

As the collision is inelastic, it means a part of kinetic energy is transformed into same other from due to collision . In this case , the kinetic energy of incident electron can be absorbed by `H` atom and it can absorb only `10.2 eV out of `11.2 eV, so that it can reach to `1^(st)` excited state and the electron leavels with remaining energy , i.e. `1.0 eV`.