A frame made of a metallic wire enclosing a surface area A is covered with a soap film. If the area of the frame of metallic wire is reduced by 50 % , the energy of the soap film will be changed by

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TestHub · Accepted Answer

Surface energy = surface tension × surface area E = S × 2 A New surface energy, % decrease in surface energy = E - E 1 E × 100 = 2 S A - S A 2 S A × 100 = 50 %

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