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At a certain instant a piece of radioactive material contain 10 12 atom.the half life the materials is 30days . calculate the time of disintegration in the first second, what time will elapsed before 10 4 atom remain , what is the count rate at this time

At a certain instant a piece of radioactive material contain 1012 atom.the half life the materials is 30days . calculate the time of disintegration in the first second, what  time will elapsed before 104 atom remain , what is the count rate at this time

Grade:7

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