$_1H^1 + _1H^1 + _1H^2 \to X + _1e^0 + \text{Energy}$. The emitted particle $X$ is ........?

$A$ nucleus of mass $M + \Delta m$ at rest decays into two daughter nuclei of equal mass $M/2$. If the speed of light is $c$,the speed of each daughter nucleus is:

In the proton-proton cycle, four hydrogen nuclei combine to release energy of ....... $MeV$.

The energy of the fast neutrons emitted in a nuclear fission reactor is approximately $\qquad$ .

In a fission reaction ${}_{92}^{236}U \to {}^{117}X + {}^{117}Y + n + n$,the binding energy per nucleon of $X$ and $Y$ is $8.5\,MeV$,whereas that of ${}^{236}U$ is $7.6\,MeV$. The total energy liberated will be about:

Complete the reaction: $n + _{92}^{235}U \to _{56}^{144}Ba + .... + 3n$