AIPMT | 2014Momentum and CollisionHard
Question
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
Options
A.Energy = 4VT 
is released
is releasedB.Energy = 3VT 
is absorbed
is absorbedC.Energy = 3VT 
is released
is releasedD.Energy is neither released nor absorbed
Solution
Energy released = (Af - Ai)T
Af = 4πR2 =
Ai = n × 4πr2 =
⇒ Energy released = 3VT
Af = 4πR2 =
Ai = n × 4πr2 =
⇒ Energy released = 3VT
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