In nuclear reactors,the speed of the neutrons is slowed down by:

The atom bomb is based on the principle of:

The calculated mass of ${}_{20}Ca^{40}$ is $40.328 \ u$. It releases $306.3 \ MeV$ energy in a nuclear process. Its isotopic mass is

In a nuclear explosion, the energy is released in the form of

The nucleus $^{64}_{29}Cu$ accepts an orbital electron to yield:

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.