Find the fraction of decrease of the kinetic energy of a neutron of mass m, in head-on collision with an atomic nucleus of mass m2 which is initially at rest 4m?m? (m1+m2)² 2m2 M1 (m,+m2)² 4m2 m1 (m,+m2)² 2m2 m² (m,+m2)²
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