The surface tension of water at 200C is 73 dynes cm-1. The minimum value of work done needed to increase surface area of water from 2 cm2 to 5 cm2 is

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192 dynes cm

219 dynes cm

921 dynes cm

912 dynes cm

answer is B.

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Detailed Solution

w = γdA = 73 × 3 = 219 dynes cm

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