First slide

Surface tension and surface energy

Question

If work W is done in blowing a bubble of radius R from a soap solution, then the work done in blowing a bubble of radius 2R from the same solution is

Moderate

A

W/2
B

2W
C

4W
D

$2 \frac{1}{3} W$

Solution

$W = 8 {πR}^{2} T ∴ W \propto R^{2}$ (T is constant)
If radius becomes double then work done will become four times.

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