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Questions  

A neutron moving with a certain kinetic energy collides head on with an atom of mass number A. The fractional kinetic energy retained by it is

a
A−1A+1
b
(A+1A−1)2
c
A+1A−1
d
(A−1A+1)2

detailed solution

Correct option is D

fraction of KE retained by m1=m1-m2m1+m22=A-1A+12

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