Radius of a soap bubble is 'r', surface tension of soap solution is T. Then without increasing the temperature, how much energy will be needed to double its radius

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4πr2T

2πr2T

12πr2T

24πr2T

answer is D.

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Detailed Solution

W=8πT(R22−R12)=8πT[(2r)2−(r)2]=24πr2T

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