The mass number of an iodine nucleus and a polonium nucleus is $125$ and $216$ respectively. The ratio of radius of iodine nucleus to that of polonium nucleus is

What is the binding energy of ${}_{14}{}^{29}Si$ whose atomic mass is $28.976495 \mathrm{u}$

Mass of proton $=1.007276 \mathrm{u}$

Mass of neutron $=1.008664 \mathrm{u}$

(Neglect the electron mass) (Assume $1 \mathrm{u}=931.5 \mathrm{MeV}$)