Test Academy | 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 (A-1/A+1)², (A+1/A-1)², (A-1/A)², (A+1/A)²

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

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