The radius of {R} of a nucleus of massnumber A can be estimated by the formula{R}= (1.3 \\times10^{-15} ) {A}^{1 \/ 3} {m} . It follows that the massdensity of a nucleus is of the order of: ( {M}_{\text{prot.}} ≅{M}_{\text{neut. }} ≃ 1.67 \\times10^{-27} {kg} ) [3 Sep 2020 Shift 2]

Correct Answer is : 1017 kg m−3