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[" A radioactive sample "S(1)" having th...

[" A radioactive sample "S_(1)" having the activity "A_(1)" has "],[" twice the number of nuclei of nuclei as another "],[" sample "S_(2)" of activity "A_(2)" .If "A_(2)=2A_(1)" ,then the ratio of "],[" half-life of "S_(1)" to the half-life of "S_(2)" is "],[[" a."0.25," b."0.75," c."4," d."2]]

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