The particle that possesses half-integral spin is:

$A$ free neutron decays into a proton,but a free proton does not decay into a neutron. This is because

The atomic number of a nucleus is $Z$ and the atomic mass number is $M$. The number of neutrons is

What is the approximate percentage of the total mass of an atom that is concentrated in its nucleus (in $\%$)?

An unstable heavy nucleus at rest breaks into two nuclei which move away with velocities in the ratio of $8:27$. The ratio of the radii of the nuclei (assumed to be spherical) is

Two protons are kept at a separation of $10 \, nm$. Let $F_{n}$ and $F_{e}$ be the nuclear force and the electromagnetic force between them, respectively.