Question

The surface tension of soap solution is $0.03N/m$. The work done in blowing to from a soap bubble of surface area $40{cm}^2$, (in $J$), is

• A. $1.2\times {10}^{-4}$
• B. $2.4\times {10}^{-4}$
• C. $12\times {10}^{-4}$
• D. $24\times {10}^{-4}$

Answer 1

The correct option is B $2.4\times {10}^{-4}$

In case of soap bubble
$W=T\times 2\times \Delta A$
$=0.03\times 2\times 40\times {10}^{-4}$
$=2.4\times {10}^{-4}J$