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[" 16.Two radioactive substances "X" and...

[" 16.Two radioactive substances "X" and "Y" initially "],[" contain an equal number of atoms.Thelr half- "],[" lives are "1" hour and "2" hours respectively.Then "],[" the ratio of their rates of disintegration after "],[" the hours is "],[[" 1) "1:1," 2) "2:1," 3) "1:2," 4) "2-3],[" 1) "1:1," 2) "2:1," 3) "1:2," 4) "2-3]],[" 1) 1:1"]

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