1.

The energy of the free surface of a liquid drop is 5π times the surface tension of the liquid. Find the diameter of the drop in C.G.S. system.

Answer»

Given : E = 5πT

To find : Diameter of the drop (d) in C.G.S. system

Formula : ΔA = 4πr2

∴ E = 4πr2T

∴ 5πT = 4πr2T

∴ 4r= 5

∴ r = \(\sqrt{\frac54}\) = \(\frac{\sqrt5}{2}\)

∴ d = 2r = \(\sqrt{5}\)

= 2.236 cm

Diameter of the drop is 2.236 cm.



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