A neutron of kinetic energy 65eV collides in elastically with a singly ionized helium atom at rest. It is scattered at an angle of \[90{}^\circ \]with respect of its original direction. If the atom get de-excited subsequently by emitting radiation, then the impossible frequency of the emitted radiation is [Given: Mass of \[He\]atom = 4\[\times \](mass of neutron), Ionization energy of atom =13.6eV]

A neutron of kinetic energy 65eV collides in elastically with a singly

1.	A neutron of kinetic energy 65eV collides in elastically with a singly ionized helium atom at rest. It is scattered at an angle of \[90{}^\circ \]with respect of its original direction. If the atom get de-excited subsequently by emitting radiation, then the impossible frequency of the emitted radiation is [Given: Mass of \[He\]atom = 4\[\times \](mass of neutron), Ionization energy of atom =13.6eV]
A.	\[1.82\times {{10}^{15}}Hz\]
B.	\[6.11\times {{10}^{15}}Hz\]
C.	\[11.67\times {{10}^{15}}Hz\]
D.	\[9.84\times {{10}^{15}}Hz\]
Answer» C. \[11.67\times {{10}^{15}}Hz\]