Question
A neutron travelling with a velocity v and energy E collides elastically with a nucleus of mass number A. Find the energy retained by the neutron after collision.
Solution
The fractional energy retained by colliding mass is,
Here, we have
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, and
K.E = E
Therefore,
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, is the energy retained by the neutron after collision.
Here, we have
, and K.E = E
Therefore,
, is the energy retained by the neutron after collision. 
