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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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