Nuclear fission is best explained by
[$AIPMT$ $2000$]

Two lithium nuclei in a lithium vapour at room temperature do not combine to form a carbon nucleus because

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:

Nuclear fission was discovered by

What is the amount of energy released by deuterium and tritium fusion (in $,MeV$)?

What is nuclear fusion? Explain giving its nuclear equations and write down the definition of thermonuclear fusion.