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A neutron collies head-on with a station...

A neutron collies head-on with a stationary hydrogen atom in ground state. Which of the following statements is/are correct ?

A

If kinetic energy of the neutron is less than 13.6eV, collision must be elastic

B

If kinetic energy of the neutron is less than 13.6eV, collision may be inelastic

C

Inelastic collision may take place on when initial kinetic energy of neutron is greater than 13.6 eV

D

Perfectly inelastic collision can not take place

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