100mg sample of tritium-3 decayed to 94.5mg after a year. (i) What is the half-life of tritium-3? (ii) How long does it take the sample to decay to 20mg?

College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
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Chapter5: Exponential And Logarithmic Functions
Section5.CR: Chapter Review
Problem 15E: The half-life of a radioactive material is about 34.2 years. How much of the material is left after...
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A 100mg sample of tritium-3 decayed to 94.5mg after a year. (i) What is the half-life of tritium-3? (ii) How long does it take the sample to decay to 20mg?

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