The force acting between proton and proton inside the nucleus is

The force between two protons is the same as the force between a proton and a neutron. The nature of the force is:

The nuclear radius of a hydrogen atom is approximately . . . . . . . (in $fm$)

The ratio of mass densities of nuclei of $^{40}Ca$ and $^{16}O$ is close to

The atomic masses of two isotopes of an element are $34.98 \ u$ and $36.98 \ u$ and their relative abundances are $75.4 \%$ and $24.6 \%$ respectively. The average atomic mass of the element is: (in $u$)

For a uranium nucleus, how does its mass vary with volume?