A neutron moving with a speed ‘v’ makes a head on collision with a stationary hydrogen atom in ground state. The minimum kinetic energy of the neutron for which inelastic collision will take place is

Question

$\begin{array}{1 1}(1) 10.2 eV \\ (2) 16.8 eV \\ (3) 12.1 eV \\ (4) 20.4 eV \end{array} $