The energy of the fast neutrons emitted in a nuclear fission reactor is approximately $\qquad$ .

Consider the following statements $A$ and $B$. Identify the correct choice in the given answer.
$A$. $p-n, p-p$ and $n-n$ forces between nucleons are not equal and charge dependent.
$B$. In a nuclear reactor, the fission reaction will be in an accelerating state if the value of the neutron reproduction factor $k > 1$.

How much energy is produced from the combustion of $1\, kg$ of coal?

Thermal neutrons can cause fission in

Nuclear fusion is common to the pair:

The binding energies of nuclei $X$ and $Y$ are $E_1$ and $E_2$ respectively. Two atoms of $X$ fuse to give one atom of $Y$ and an energy $Q$ is released. Then: