Assume that protons and neutrons have equal masses. Mass of a nucleon is 1.6 × 10^-27 kg and radius of nucleus is 1.5 × 10^-15 A^1 / 3 m. The…

Assume that protons and neutrons have equal masses. Mass of a nucleon is $\displaystyle 1.6 \times 10^{-27} \mathrm{~kg}$ and radius of nucleus is $\displaystyle 1.5 \times 10^{-15} \mathrm{~A}^{1 / 3} \mathrm{~m}$. The approximate ratio of the nuclear density and water density is $\displaystyle n \times 10^{13}$. The value of $\displaystyle n$ is $\displaystyle \_\_\_\_$.