BITSAT2010PhysicsMechanical Properties of FluidsActual
Two mercury drops (each of radius r ) merge to form a bigger drop. The surface energy of the bigger drop, if T is the surface tension, is
Options
- A2^ 5 / 3 r² T
- B4 r ² ~T
- C2 ² T
- D2^ 8 / 3 r ² ~T
Correct answer
D. 2^ 8 / 3 r ² ~T
Step-by-step solution
4 3 R³=2 4 3 r³ R =2^ 1 / 3 r Surface energy of bigger drop, E =4 R² T=4 2^ 2 / 3 r² T=2^ 8 / 3 r² T