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The ratio of the masses of the elements having their nuclear radii 2 fermi and 1 fermi is
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The correct answer is:
8
Here $R_1=2 \mathrm{fm}, R_2=1 \mathrm{fm}$ The radius of nucleus is, $R \propto A^{1 / 3}$
$$
\therefore \frac{A_1}{A_2}=\left(\frac{R_1}{R_2}\right)^3=\left(\frac{2}{1}\right)^2=8
$$
$$
\therefore \frac{A_1}{A_2}=\left(\frac{R_1}{R_2}\right)^3=\left(\frac{2}{1}\right)^2=8
$$
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