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Question

Work W is required to be done to form a spherical bubble of volume V from a given soap solution. How much work is needed to form a spherical bubble of volume 2V?


  1. 2 W

  2. 2 W

  3. (41/3)W

  4. (21/3)W


Solution

The correct option is C

(41/3)W


W=8 πr2σ. Now V=43πr3. Hence

W=8 πσ(3V4π)2/3,i.e.W α V2/3

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