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A neutron travelling with a velocity v & K.E. E collides perfectly elastically head on with the nucleus of an atom of mass number

A neutron travelling with a velocity v & 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) A- 4+1) (4-) A (b) A- A-1, (a)(4+1)* A

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