03:If 250 mg o a radioactive element decays to 230 mg in 60 hours, what is the half life of the element?
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You can express the fraction of original material remaining at time t by the expression (1/2)^(t/h) where h is the half-life and t is the elapsed time (in the same units). The problem here states that you go from 250 to 230 mg in 60 hours, so you want to find the value of h that makes 230/250 = (1/2)^(60/h). That will be your half-life. It’s pretty close to 500 hours
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