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A soap bubble of initial radius r is to be blown up. The surface tension of the soap film is T. The surface energy needed to double the diameter of the bubble without change in temperature, is
detailed solution
Correct option is A
Change in area of one surface ΔA=4π2r2−r2=12 πr2∴Total change in area = 24 πr2T=ΔUΔA⇒ΔU=TΔA=24πr2TTalk to our academic expert!
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