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Measurements of the radioactivity of a certain isotope tell you that the decay rate decreases from 8355 decays per minute to 3085 decays per minute

Measurements of the radioactivity of a certain isotope tell you that the decay rate decreases from 8355 decays per minute to 3085 decays per minute over a period of 4.50 days . What is the half-life T1/2 of this isotope? (in days)

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