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-The half-life of a radioactive substance is 65 years. If you start with some amount of this substance, what fraction will remain in 132 years?

Question

Quizplus · Accepted Answer

In 132 years, the substance will go through 132 / 65 = 2.03 half-lives, approximately 2 half-lives. After one half-life, half of the substance remains, and after two half-lives, half of that amount remains, so 1/2 * 1/2 = 1/4 or 0.25. The answer closest to this calculation is 0.24.

Provide an Appropriate Response