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(1 point) An unknown radioactive element decays into non-radioactive substances. In 500 days the radioactivity of...

(1 point) An unknown radioactive element decays into non-radioactive substances. In 500 days the radioactivity of a sample decreases by 39 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 57 mg?
time needed:  (days)

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