Question

A soap bubble is blown such that its diameter increases from 'd' to 'D'. The amount of work done is ______.

(T = surface tension of soap solution)

Options

• 4π(D² - d²)T

• 2π(D² - d²)T

• 8π(D² - d²)T

• π(D² - d²)T

Answer 1

A soap bubble is blown such that its diameter increases from 'd' to 'D'. The amount of work done is 2π(D² - d²)T.

Explanation:

`"W"=(4piT)/4(D^2-d^2)xx2=2pi(D^2-d^2)T`