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OpenStudy (anonymous):
An unknown radioactive element decays into non-radioactive substances. In 240 days the radioactivity of a sample decreases by 45 percent. (a) What is the half-life of the element? in (days) (b) How long will it take for a sample of 100mg to decay to 58 mg? in (days)
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OpenStudy (anonymous):
i dont know how to use the y=Ce^kt equation to solve for this problem. Help!!
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