Question

There is a soap solution of which coefficient of surface tension is $0.03 \, N m^{- 1 \, }$ . the work done in blowing to from a soap bubble of surface area $40 \, \left(c m\right)^{2},\left(i n \, J\right), \, is$

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

Answer 1

Answer: (B)

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