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A 12-G Sample of Radioactive Iodine Decays in Such a Way

Question 68

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A 12-g sample of radioactive iodine decays in such a way that the mass remaining after t days is given by m(t)=12e−0087tm ( t ) = 12 e ^ { - 0087 t } , where m(t)m ( t ) is measured in grams. After how many days is there only 4 g remaining?

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