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) :

Select all that apply

• Option A

  If kinetic energy of the neutron is less than 20.4 eV collision must be elastic.

• Option B

  If kinetic energy of the neutron is less than 20.4 eV collision may be inelastic.

• Option C

  Inelastic collision may be take place only when initial kinetic energy of neutron is greater than 20.4 eV.

• Option D

  Perfectly inelastic collision cannot take place.