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[" (A) "0.27MeV],[" In a sample of radio...

[" (A) "0.27MeV],[" In a sample of radioactive material,what fraction of the initial number of active nuclei will remain "],[" undisintegrated after half of a half-life of the sample? "],[[" (A) "1/4," (B) "1/2sqrt(2)],[" The activity of a sample of radioactive material is "A_(1)" at time "t_(1)" ,and "A_(2)" at time "t_(2)(t_(2)>t_(1))" .Its mean life is "T" ,"]]

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