Question
A neutron travelling with a velocity v and K.E. E collides perfectly elastically head on with the nucleus of an atom of mass number A at rest. The fraction of total energy retained by neutron is
Options :
(A-1/A+1)²
(A+1/A-1)²
(A-1/A)²
(A+1/A)²
Answer :
(A-1/A+1)²
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