A certain number of spherical drops of a liquid of radius r coalesce to form a single drop of radius R and volume V. If T is the surface tension of the liquid, then
is released 
is absorbed 
is released Text Solution
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Here, if the surface area changes, it will change the surface energy as well. If the surface area decreases, it means that energy is released and vice-versa.
Change in surface energy 
… (i)
Let we have n number of drops initially.
So, 
… (ii)
Volume is constant.
So, 
… (iii)
From Eqs. (ii) and (iii), we get
As 
, so 
is negative. It means that surface area is decreased, so energy must be released.
Energy released 
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