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The amount of the work done in blowing a...

The amount of the work done in blowing a soap bubble of radius r and surface tension `sigma`, is:

A

`4pir^(2)sigma`

B

`6pir^(2)sigma`

C

`8pir^(2)sigma`

D

`sigma`

Text Solution

Verified by Experts

The correct Answer is:
C
The amount of work done = surface tension `xx` increase in area
`=sigmaxx2xx(4pir^2)=8pir^(2)sigma`
This is because, a soap bubble has two surface areas.
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