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[" A cylinder with a movable piston same "],[" pressure "p_(2)" to which the air should be compressed by slowiy pushing the piston ito the cyline "],[" soap bubble to reduce its size by half will be : (The surrace tension is "sigma" ,and the temper "],[" maintained constant) "],[[" (A) "[8p_(1)+(24 sigma)/(r)]," (B) "[4p_(1)+(24 sigma)/(r)]," (C) "[2p_(1)+(24 sigma)/(r)]," (D) "2p_(1)+(12 sigma)/(r)]]

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