An electron with kinetic energy `5eV` is incident on a hydrogen atom in its ground state.The collision

Options

A. must be elastic
B. must be completely incleastic
C. may be partially elastic
D. information is insufficient

Answer

A

Explanation

For a collisiomof neutron with hydrogen atom in ground state to be inelastic (partical or complete). The minimum `KE` or striking neutron must be `20.4 eV. [This condition is derivedin theory.] ltbgt As the energy of the given incident neutron is less than `2.4 eV`, the collsion must be elastic.