MHT CET202013 Oct 2020Evening ShiftPhysicsMechanical Properties of FluidsActual
small drops of liquid of same radius coalesce to form a big drop. The ratio of the total surface energies after and before the change is
Options
- A2³: 1
- B2^ - 1 3 : 1
- C2^ - 2 3 : 1
- D2^ 2 3 : 1
Correct answer
B. 2^ - 1 3 : 1
Step-by-step solution
2 4 3 r³= 4 3 R³ R=2^ 1 3 r Ratio of energies E₂ E₁ = 4 R² T 2 r² T E₂ E₁ = R² 2 r² = 2^ 2 3 r² 2 r² =2^ 2 3 -1 =2^ - 1 3