First slide

Surface tension and surface energy

Question

The work done in blowing a soap bubble of radius 0.2 m is (the surface tension of soap solution being 0.06 N/m)

Easy

A

$192 π \times 10^{- 4} J$
B

$280 π \times 10^{- 4} J$
C

$200 π \times 10^{- 3} J$
D

None of these

Solution

$W = 8 π r^{2} \times T = 8 π \times (0.2)^{2} \times 0.06 = 192 π \times 10^{- 4} J$

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