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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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By Expert Faculty of Sri Chaitanya
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.

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detailed solution

Correct option is A

Loss of energy for inelastic collision =E2                                                 (When m1=m2 ) ∴ Emin2=10.2eV             [First excitation energy] ⇒Emin=20.4eV
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A ball A collides elastically with another identical ball B with a velocity of 10 ms-1 making an angle of 30° with the line joining their centres C1 and C2. Select the correct statement(s).

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