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Q.

E is surface energy of a liquid drop. If this drop is sprayed into 64 identical drops, the surface energy of all those drops is

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a

4E

b

8E

c

16E

d

32E

answer is A.

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Detailed Solution

Surface energy is proportional to surface area so, $\frac{E_{2}}{E_{1}} = \frac{{nr}^{2}}{R^{2}}$ '

and from conservation of volume, $R = n^{1 / 3} r$

Solving, we get $E_{2} = 4 E$

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