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

Options

A. `2piTD^(2)`
B. `4piTD^(2)`
C. `6piTD^(2)`
D. `8piTD^(2)`

Answer

C

Explanation

`W = 2T xx pi [ D_(2)^(2) - D_(1)^(2))] = 2piT (4D^(2)-D^(2)) = 6piTD^(2)`