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Q.

A soap bubble of radius r is blown up to form a bubble of radius 2r under isothermal conditions. If T is the surface tension of bubble the energy spent in the blowing is 

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a

12πTr2

b

24πTr2

c

3πTr2

d

6πTr2

answer is D.

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Detailed Solution

Energy E = TΔA=T.24π2r2−4πr2

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A soap bubble of radius r is blown up to form a bubble of radius 2r under isothermal conditions. If T is the surface tension of bubble the energy spent in the blowing is