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Measurements of the radioactivity of a certain isotope tell you that the decay rate decreases from...

Measurements of the radioactivity of a certain isotope tell you that the decay rate decreases from 8315 decaysperminutedecaysperminute to 3040 decaysperminutedecaysperminute over a period of 3.50 daysdays .What is the half-life T1/2T1/2T_1/2 of this isotope?

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