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

  1. A

    4.5×104J

  2. B

    6.0×104J

  3. C

    4.5×105J

  4. D

    7.5×104J

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    Solution:

    Work done 

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

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