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1) I 131 has a rate of the decay of 8.3% per day, what is this isotope's half life? 2) It was observed that a

1) I¹³¹ has a rate of the decay of 8.3% per day, what is this isotope's half life?

2) It was observed that a population had a the same doubling time of 14.2 years over many cycles of growth.What is the rate constant per year involved here?

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