The surface tension of a soap solution i...

The surface tension of a soap solution is `30 xx 10^(-3) Nm^(-1)`. The work done in stretching a bubble of this solution of surface area , 5cm x 5cm , to an area of 10cm x 10cm , is

A

S

B

`6.0 xx 10^(-4) J`

C

`4.5 xx 10^(-5) J`

D

`7.5 xx 10^(-4) J`

Verified by Experts

The correct Answer is:

A

Work done
` = 2 (A_2 - A_1) xx S`
` = 2 (10 xx 10 - 5 xx 5) xx 10^(-4) m^2 xx 30 xx 10^(-3) Nm^(-1)`
` = 4.5 xx 10^(-4) J`

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