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Q.

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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a

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

b

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

c

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

d

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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