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Answer parts a and b 1 of the questions remains unanswered. (1 point) An unknown radioactive element decays into non-radioactive substances. In 500 days the

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Answer parts a and b

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1 of the questions remains unanswered. (1 point) An unknown radioactive element decays into non-radioactive substances. In 500 days the radioactivity of a sample decreases by 64 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 95 mg? time needed: (days)

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