The phenomenon of radioactivity arises from the

If the amount of radioactive substance is increased three times and simultaneously the temperature is also increased three times,the number of atoms disintegrating per unit time would be

Consider the following nuclear reactions:
$_{92}^{238}M \to _{y}^{x}N + 2_{2}^{4}He$
$_{y}^{x}N \to _{B}^{A}L + 2\beta^{+}$
The number of neutrons in the element $L$ is:

The element $_{90}Th^{232}$ belongs to the thorium series. Which of the following will act as the end product of this series?

If the mass defect of a nuclide is $3.32 \times 10^{-26} \ g$,its binding energy in $MeV$ is:

The atomic mass of lead is $208$ and atomic number is $82$. The atomic mass of bismuth is $209$ and atomic number is $83$. The ratio of $n/p$ in the atom is