A heavy nucleus is unstable for any value of $\frac{N}{P}$ because

A nucleus disintegrates into two nuclear parts, in such a way that ratio of their nuclear sizes is $1: 2^{1 / 3}$.Their respective speed have a ratio of $n: 1$. The value of $n$ is $…..$.

The nuclear force between two nucleons is explained by

Ratio of nuclear radii of ${ }^{135} Cs$ to ${ }^{40} Ca$ is

In the nuclear reaction $_{92}{U^{238}}{ \to _z}T{h^A}{ + _2}H{e^4}$, the values of $A$ and $Z$ are