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An unknown radioactive element decays into non-radioactive substances. In 580 days me radioactivity of a sample decreases by 45 percent. (a) What is the

An unknown radioactive element decays into non-radioactive substances. In 580 days me radioactivity of a sample decreases by 45 percent. (a) What is the half-life of the element? half-life: (days) (b) How long will it take for a sample of 100 mg to decay to 87 mg? time needed: (days)

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