In a nuclear reactor,heavy nuclei are not used as moderators because:

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 $k > 1$.

The binding energy per nucleon in deuterium and helium nuclei are $1.1 \, MeV$ and $7.0 \, MeV,$ respectively. When two deuterium nuclei fuse to form a helium nucleus,the energy released in the fusion is ........... $MeV$.

Two lithium nuclei in a lithium vapour at room temperature do not combine to form a carbon nucleus because

Light energy emitted by stars is due to

When two deuteron nuclei fuse to form a helium nucleus,energy is released because the mass of the helium nucleus is .....