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A neutron travelling with a velocity and...

A neutron travelling with a velocity and kinetic energy E collides elastically head on with the nucleus of an atom of mass number A at rest. The fraction of total energy retained by the neutron is approximately equal to :

A

`[(A + 1)/(A - 1)]^2`

B

`[(A - 1)/(A + 1)]^2`

C

`[A/(A - 1)]^2`

D

`[(A + 1)/(A)]^2`

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