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 soap solution, the energy spent in the blowing(in J) is:
A
3πTr2
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B
6πTr2
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C
12πTr2
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D
24πTr2
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Solution
The correct option is C24πTr2 Energy of a soap bubble =2×T×(4πR2)