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Q.

A liquid drop of radius R breaks into 64 tiny drops each of radius r. If the surface tension of liquid is T, then the gain in energy is:

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a

48πR2T

b

12πr2T

c

96πR2T

d

192πr2T

answer is D.

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Detailed Solution

∆E=4πR2(n1/3-1) R=n1/3r=(64)1/3r=4r ∆E=192πr2T
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