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After 90 years, 20 % of a radioactive material decays. What is the half-life?

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter30: Nuclear Physics

Section: Chapter Questions

Problem 12CQ: What fraction of a radioactive sample has decayed after two half-lives have elapsed?

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