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An unknown radioactive element decays into non-radioactive substances. In 240 days the radioactivity of a sample decreases by 48 percent. (a) What is the half-life

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An unknown radioactive element decays into non-radioactive substances. In 240 days the radioactivity of a sample decreases by 48 percent. (a) What is the half-life of the element? Round to two decimal places. (b) How long will it take for a sample of 100 mg to decay to 78 mg? time needed: ' (days) Round to two decimal places. Fleck Answer l

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