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Radius of a soap bubble is 'r ', surface...

Radius of a soap bubble is 'r ', surface tension of soap solution is T. Then without increasing the temperature, how much energy will be needed to double its radius

A

`4 pir^2 T`

B

`2 pir^2 T`

C

`12 pir^2 T`

D

`24 pir^2 T`

Text Solution

Verified by Experts

The correct Answer is:
D
For soap bubble
`W=8piT(R_2^2-R_1^2)=8piT[(2r)^2-r^2]=24piTr^2`
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