In a working nuclear reactor,Cadmium rods (control rods) are used to

In an $\alpha$-decay,the kinetic energy of the $\alpha$-particle is $48 \, MeV$ and the $Q$-value of the reaction is $50 \, MeV$. The mass number of the mother nucleus is:

Assertion: Heavy water is a better moderator than normal water.
Reason: Heavy water absorbs neutrons more efficiently than normal water.

If there is a mass defect of $0.1\%$ in a nuclear fission process,how much energy will be released in the fission of $1\, kg$ of mass?

The process that mainly takes place in stars to produce energy is:

The energy liberated per nuclear fission is $200 \; MeV$. If $10^{20}$ fissions occur per second,the amount of power produced will be: