A neutron is moving with a velocity u.It collides head on and elastically with an atom of mass number A. If the initial kinetic energy of the neutron be E. How much kinetic energy will be retained by neutron after collision?

Options

(a) {A-1/A+1}² E
(b) {A+1/A-1}² E
(c) {A-1/A}² E
(d) {A+1/A}² E

Correct Answer:

{A-1/A+1}² E

Explanation:

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