Show that the volume of nucleus is proportional to its atomic mass number.
Ratio of nuclear radii of ${ }^{135} Cs$ to ${ }^{40} Ca$ is
For effective nuclear forces, the distance should be
The ratio of mass densities of nuclei of $^{40}Ca$ and $^{16}O$ is close to
A heavy nucleus is unstable for any value of $\frac{N}{P}$ because