The most stable particle in the Baryon group is

The graph between $\log R$ and $\log A$,where $R$ is the nuclear radius and $A$ is the mass number,is:

Which statement is true for the nuclear force?

Given below are two statements $:$ one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A) :$ The density of the copper $\left({ }_{29}^{64} Cu \right)$ nucleus is greater than that of the carbon $\left({ }_6^{12} C \right)$ nucleus.
Reason $(R) :$ The nucleus of mass number $A$ has a radius proportional to $A^{1/3}$.
In the light of the above statements,choose the most appropriate answer from the options given below.

Who discovered the neutron?

Show that the volume of a nucleus is proportional to its atomic mass number $A$.