Nuclear Physics and RadioactivityHard

Question

A neutron collides head - on with a stationary hydrogen atom in ground state. Which of the following  statements are correct (Assume that the hydrogen atom and neutron has same mass)  

Options

A.If kinetic energy of the neutron is less than 20.4 eV collision must be elastic 
B.If kinetic energy of the neutron of the neutron is less than 20.4 eV collision may be inelastic
C.Inelastic collision may take place only when initial energy of neutron is greater than 20.4 eV
D.Perfectly inelastic collision can not take place

Solution

K ≥ 20.4 eV for inelastic collision

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