A neutron moving with a certain kinetic energy collides head on with an atom of mass number A. The fractional kinetic energy retained by it is

A neutron moving with a certain kinetic energy collides head on with a

1.	A neutron moving with a certain kinetic energy collides head on with an atom of mass number A. The fractional kinetic energy retained by it is
Answer» `(A-1)/(A+1)` `((A+1)/(A-1))^(2)` `(A+1)/(A-1)` `((A-1)/(A+1))^(2)` ANSWER :D