First slide

Surface tension

Question

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

Moderate

A

4E
B

8E
C

16E
D

32E

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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