The surface tension of soap solution is . The amount of work done required to increase the radius of a soap bubble from 10 cm to 20 cm is ______ [2023]

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Solution

Q.
The surface tension of soap solution is $3.5 \times 10^{- 2} {Nm}^{- 1}$ . The amount of work done required to increase the radius of a soap bubble from 10 cm to 20 cm is ______ $\times 10^{- 4} J .$ [2023]

Ans.
(264)

$W = T (Δ A)$

$W = T (8 π (r_{2}^{2} - r_{1}^{2}))$ $= 264 \times 10^{- 4} J$

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