Radioactivity is due to

Consider an $\alpha$-particle just in contact with a $_{92}U^{238}$ nucleus. Calculate the coulombic repulsion energy (i.e.,the height of the coulombic barrier between $U^{238}$ and $\alpha$-particle) assuming that the distance between them is equal to the sum of their radii.

Which atomic species cannot be used as a nuclear fuel?

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

The proper rays for radiocarbon dating are

Nuclear fusion produces