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Calculate the work done by a boy In maki...

Calculate the work done by a boy In making a soap bubble of diameter `1.4 cm ` by blowing .if he surface tension of soap solution is `0.03 N//m`

A

`3xx10^(-5) J`

B

`3.696xx10^(-5) J`

C

`2xx10^(-5) J`

D

`4.2xx10^(-5) J`

Text Solution

Verified by Experts

Intial area of soap bubble =0
Soap bubble has two surfaces internal and external.
Increase in surface area `=DeltaA=2xx4pir^(2)`
`=2xx4xx(22)/(7)xx(0.7xx10^9-2)^(2)`
`=12.32xx10^(-4)m^(2)`
Work done `=W-SDeltaA`
`=0.03xx12.32xx10^(-4)`
`=3.696xx10^(-5) J`
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