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a
If kinetic energy of the neutron is less than 20.4 eV, collision must be elastic.
b
Perfectly inelastic collision can not take place.
c
If kinetic energy of the neutron is less than 20.4 eV, collision must be inelastic.
d
Inelastic collision may take place only when initial kinetic energy of the neutron is greater than 20.4 eV.
answer is A, C.
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