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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Solution

The correct option is D

$W = 8 π T (R_{2}^{2} - R_{1}^{2}) = 8 π T [(2 r)^{2} - (r)^{2}] = 24 π r^{2} T$

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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

The correct option is D W=8πT(R22−R21)=8πT[(2r)2−(r)2]=24πr2T

The correct option is D

$W = 8 π T (R_{2}^{2} - R_{1}^{2}) = 8 π T [(2 r)^{2} - (r)^{2}] = 24 π r^{2} T$