The​ half-life of a radioactive substance is 50 years. If you start with some amount of this​ substance, what fraction will remain in 150 years?

Chemistry for Today: General, Organic, and Biochemistry
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Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
Publisher:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
Chapter10: Radioactivity And Nuclear Processes
Section: Chapter Questions
Problem 10.77E
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The​ half-life of a radioactive substance is 50 years. If you start with some amount of this​ substance, what fraction will remain in 150 years? 

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