For a nucleus, the volume \( V \) is proportional to \( A \), the mass number, given by:
\[ V = \frac{4}{3}\pi R^3, \]where the radius \( R \) of a nucleus is proportional to the cube root of its mass number \( A \):
\[ R = R_0 A^{1/3}. \]Thus, the volume \( V \) of a nucleus can be expressed as:
\[ V \propto A. \]Since \( A_2 = 4A_1 \), the ratio of volumes is:
\[ \frac{V_2}{V_1} = \frac{A_2}{A_1} = 4. \]20 mL of sodium iodide solution gave 4.74 g silver iodide when treated with excess of silver nitrate solution. The molarity of the sodium iodide solution is _____ M. (Nearest Integer value) (Given : Na = 23, I = 127, Ag = 108, N = 14, O = 16 g mol$^{-1}$)