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[" 12.Define the term decay constant of a "],[" radioactive sample.The rate of "],[" disintegrations of a given radioactive "],[" nucleus is "10000" disintegrations/s and "],[5000" disintegrations/s after "20h" and "30h" ,"],[" respectively from start.Calculate the half "],[" life and initial number of nuclei at "t=0" ."],[" belhizolg "]

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