Question: A neutron moving with a certain KE collides head on with an atom of mass number A. The fractional KE retained by it is
A neutron moving with a certain KE collides head on with an atom of mass number A. The fractional KE retained by it is (A) 4-1 A+1 (e) () (B) (C) 4+1 A-1 () () 2 A+1
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