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1 point) An unknown radioactive element decays into non-radioactive substances. In 740 days the radioactivity of a sample decreases by 50 per a) What

1 point) An unknown radioactive element decays into non-radioactive substances. In 740 days the radioactivity of a sample decreases by 50 per a) What is the half-life of the element? alf-life: (days) b) How long will it take for a sample of 100 mg to decay to 68 mg? me needed: (days)

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