Two soap bubbles A and B are kept in a closed chamber where the air is maintained at pressure $8 \mathrm{~N} / \mathrm{m}^2$. The radii of bubbles $A$ and $B$ are 2 cm and 4 cm , respectively. Surface tension of the soap-water used to make bubbles is $0.04 \mathrm{~N} / \mathrm{m}$. Find the ratio $\mathrm{n}_{\mathrm{B}} / \mathrm{n}_{\mathrm{A}}$, where $\mathrm{n}_{\mathrm{A}}$ and $\mathrm{n}_{\mathrm{B}}$ are the number of moles of air in bubbles A and B , respectively. [Neglect the effect of gravity.]