(D) The radius $R$ of a nucleus is related to its mass number $A$ by the empirical formula: $R = R_0 A^{1/3}$ where $R_0$ is a constant (approximately

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(D) The radius $R$ of a nucleus is related to its mass number $A$ by the empirical formula: $R = R_0 A^{1/3}$ where $R_0$ is a constant (approximately $1.2 \times 10^{-15} \ m$). From this relation,it is clear that the radius $R$ is directly proportional to the cube root of the mass number $A$,i.e.,$R \propto A^{1/3}$.