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Handout
Michigan State University

Michigan State University: Decay Constants and Half Lives

For Students 9th - 10th Standards
This site from the Michigan State University provides a short review of decay constants and half-lives.
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Handout
University College London

University College London: Exponential Decay

For Students 9th - 10th
This site from the University College London's Department of Mathematics discusses how to use the decay equation.