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((1)/(r )+(1)/(R ))" is released"`
B. `"energy "=3VT((1)/(r )+(1)/(R ))" is absorbed"`
C. `"energy "=3VT((1)/(r )-(1)/(R ))" is released"`
D. energy is neither released nor absorbed.

Answer

C

Explanation

`W=TxxDeltaA`