The force between a proton and a proton in a nucleus is .......

Define $Z$,$A$,and $N$ by describing the structure of an atom.

The ratio of the nuclear radii of elements with mass numbers $216$ and $125$ is

$A$ nucleus at rest disintegrates into two smaller nuclei with their masses in the ratio of $2:1$. After disintegration,they will move:

Which of the following particles are constituents of the nucleus?

$A$ nucleus at rest splits into two nuclear parts having the same density and radii in the ratio $1:2$. Their velocities are in the ratio $\qquad$ . (in $:1$)