A neutron travelling with a velocity v and kinetic energy E collides perfectly 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

\[{{\left( \frac{A+1}{A-1} \right)}^{2}}\]

\[{{\left( \frac{A-1}{A+1} \right)}^{2}}\]

\[{{\left( \frac{A+1}{A-1} \right)}^{2}}\]

\[{{\left( \frac{A-1}{A} \right)}^{2}}\]

\[{{\left( \frac{A+1}{A} \right)}^{2}}\]

A neutron travelling with a velocity v and kinetic energy E collides p

1.	A neutron travelling with a velocity v and kinetic energy E collides perfectly 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
A.	\[{{\left( \frac{A-1}{A+1} \right)}^{2}}\]
B.	\[{{\left( \frac{A+1}{A-1} \right)}^{2}}\]
C.	\[{{\left( \frac{A-1}{A} \right)}^{2}}\]
D.	\[{{\left( \frac{A+1}{A} \right)}^{2}}\]
Answer» B. \[{{\left( \frac{A+1}{A-1} \right)}^{2}}\]

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A neutron travelling with a velocity v and kinetic energy E collides perfectly 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

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