MHT CET20225 Aug 2022Evening ShiftPhysicsMechanical Properties of FluidsActual
The surface tension of a soap solution is ' T '. Work done in blowing a soap bubble of diameter 2 ~d is
Options
- A8 d^2 T
- B2 d^2 T
- C4 d^2 T
- D6 d^2 T
Correct answer
A. 8 d^2 T
Step-by-step solution
In this case, work done = increase in surface energy, i.e. W = T A Key point: In calculation, area of sphere have been multiplied with 2, since there are two surfaces in soap bubble. aligned & W = T [2 (4 d ^2 ) ] & W =8 d ^2 ~T aligned