Question

If T is the surface tension of soap solution, the amount of work done in blowing a soap bubble from a diameter D to 2D is

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

$W=2\pi (D^2-d^2)T=2\pi \lfloor (2D{)}^2-(D{)}^2\rfloor T=6\pi D^{2}T$