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Q.

The surface tension of a soap solution is 30×103Nm1. The work done in stretching a bubble of this solution of surface area 5cm×5cm, to an area of 10cm×10cm, is

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a

4.5×104J

b

6.0×104J

c

4.5×105J

d

7.5×104J

answer is C.

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Detailed Solution

Work done 

=2A2A1×S=2(10×105×5)×104m2×30×103Nm1=4.5×105J.

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