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):

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

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

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

Perfectly inelastic collision can not take place.

answer is A.

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Detailed Solution

Loss of energy for inelastic collision =E2 (When m1=m2 ) ∴ Emin2=10.2eV [First excitation energy] ⇒Emin=20.4eV

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