Work done in blowing a soap bubble of volume V is W. What will be the work done in blowing a soap bubble of volume 8V?

$$\begin{gathered} \mathrm{volume} \mathrm{is} \mathrm{proportional} \mathrm{cube} \mathrm{of} \mathrm{the} \mathrm{radius} \\ \mathrm{if} \mathrm{volume} \mathrm{increases} \mathrm{to} \mathrm{eight} \mathrm{times} \mathrm{raidus} \mathrm{bceomes} \mathrm{double} \\ \mathrm{Surface} \mathrm{area} \mathrm{becomes} 4 \mathrm{times}. \\ \mathrm{hence} \mathrm{surface} \mathrm{potential} \mathrm{energy} \mathrm{also} \mathrm{becomes} 4 \mathrm{times} \\ \mathrm{As} \mathrm{a} \mathrm{result}, \mathrm{work} \mathrm{done} = 4\mathrm{W} \end{gathered}$$