Strontium-90 is radioactive and has a half life of 28.8 years. What percentage of a sample would be left after "140" years?

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter18: Nuclear Chemistry
Section: Chapter Questions
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Strontium-90 is radioactive and has a half life of 28.8 years. What percentage of a sample would be left after "140" years?

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