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

question 68

Short Answer

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

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