When a slow neutron goes sufficiently close to a ${^{235}U}$ nucleus,then the process which takes place is

If the mass defect of ${ }_{5}^{11}B$ is $0.081 \ u$, its average binding energy (in $MeV$) is

If the binding energy per nucleon of $_1H^2$ is $x$ and that of $_2He^4$ is $7x$,then the ratio of the energy liberated in the reaction $_1H^2 + _1H^2 \to _2He^4$ to the binding energy per nucleon of $_1H^2$ is:

The number of neutrons in a parent nucleus $X$,which gives a $_7N^{14}$ nucleus after two successive $\beta$ emissions,is:

$_{13}^{27}Al$ is a stable isotope. $_{13}^{29}Al$ is expected to disintegrate by

In the Thorium series,$_{90}Th^{232}$ loses a total of $6$ $\alpha$-particles and $4$ $\beta$-particles in ten stages. The final isotope produced in the series is