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#### Question

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.

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'n' droplets of equal size of radius r coalesce to form a bigger drop of radius R. The energy liberated is equal to...................

(T =Surface tension of water)

`(a) 4piR^2T[n^(1/3)-1]`

`(b) 4pir^2T[n^(1/3)-1]`

`(c) 4piR^2T[n^(2/3)-1]`

`(d)4 pir^2T[n^(2/3)-1]`

Angle of contact for the pair of pure water with clean glass is _______.

(A) acute

(B) obtuse

(C) 90^{o}

(D) 0^{o}

The surface tension of water at 0°C is 75-5 dyne/cm. Calculate surface tension of water at 25°C.

(∝ for water = 2*7x1O^{-3}/°C)

The surface tension of water at 0ºc is 75·5 dyne/em. Find surface tension of water at 25°C. [α for water = 0·0021/°C]

A raindrop of diameter 4 mm is about to fall on the ground. Calculate the pressure inside the raindrop. [Surface tension of water T = 0.072 N/m, atmospheric pressure = 1.013 x 10^{5} N/m^{2} ]