A liquid column of height 0.04 cm balances excess pressure of a soap bubble of certain radius. If density of liquid is 8 × 10^3 kg m^-3 and surface…

A liquid column of height $\displaystyle 0.04$ cm balances excess pressure of a soap bubble of certain radius. If density of liquid is $\displaystyle 8 \times 10^3 \mathrm{~kg} \mathrm{~m}^{-3}$ and surface tension of soap solution is $\displaystyle 0.28 \mathrm{Nm}^{-1}$, then diameter of the soap bubble is $\displaystyle \_\_\_\_$ cm. (if $\displaystyle \mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2}$ )