Question

Calculate the work done in blowing a soap bubble from a radius of 2cm to 3cm. The surface tension of the soap solution is 30 dyne/cm.

​

Answer 1

Hii..

We know that a bubble has two surfaces in contact with air, so the total surface area of the bubble will be

=2×(4πR²)=8πR²

Now, work done=Surface tension × Increase in surface area=

2.5x10^-2 ×(8πR²−0)= 5.652x10^-2J

OR 0.056J

hope it helps u