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NEET 2014 Physics question

PhysicsMechanical Properties of FluidsNEET 2014

A certain number of spherical drops of a liquid of radius coalesce to form a single drop of radius and volume . If '' is the surface tension of the liquid, then

Answer: (3)

Solution

Energy released (surface area decreases on coalescence). Final area: . Number of small drops ,

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Question ID VK-091488