How many neutrons are more than protons in the ${ }_{92}^{235} U$ nucleus?

Which of the following is true for a sample of $U^{235}$ and $U^{238}$ isotopes?

The electric potential at the surface of an atomic nucleus $(Z=50)$ of radius $9 \times 10^{-15} \,m$ is

Highly energetic electrons are bombarded on a target of an element containing $30$ neutrons. The ratio of the radius of the nucleus to that of a Helium nucleus is $14^{1/3}$. The atomic number of the nucleus will be

As the mass number $A$ increases, which of the following quantities related to a nucleus does not change?

Two nuclei have their mass numbers in the ratio of $1: 3$. The ratio of their nuclear densities would be