The surface tension of soap solution is $0.03 \mathrm{~N} / \mathrm{m}$. The work done in blowing to form a…
The surface tension of soap solution is $0.03 \mathrm{~N} / \mathrm{m}$. The work done in blowing to form a soap bubble of surface area $40 \mathrm{~cm}^2$, (in J), is
$1.2 \times 10^{-4}$
$2.4 \times 10^{-4}$
$12 \times 10^{-4}$
$24 \times 10^{-4}$
Solution
In case of soap bubble
$
\begin{aligned}
W & =T \times 2 \times \Delta A \\
& =0.03 \times 2 \times 40 \times 10^{-4} \\
& =2.4 \times 10^{-4} \mathrm{~J}
\end{aligned}
$