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[" 4.A soap bubble of radius "1/sqrt(pi)...

[" 4.A soap bubble of radius "1/sqrt(pi)cm" is expanded "],[" radius "2/sqrt(pi)cm" .Calculate the work done.Surfag "],[" tension of soap solution = "30" dyne "cm^(-1)" ."],[" 5.What amount of energy will ho lih."]

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