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[" The radioactive sources "A" and "B" ot halt-lives of "2" hr and "4" hr respectively,initially contain "],[" the ame number of radioctive atoms.At the end of "2" hours,their rates of disintegration "],[" are in the ratio: "],[[" (A) "4:1," (B) "2:1," (C) "sqrt(2):1," (D) "1:1]]

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