Cesium-131 has a half-life of 9.7 days.What percent of a cesium-131 sample remains after 62 days?

Name: Cesium-131 has a half-life of 9.7 days.What percent of a cesium-131 sample remains after 62 days?
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Quizplus · Accepted Answer

To find the percent of cesium-131 remaining after 62 days, we use the half-life formula. The number of half-lives that have passed is 62 days / 9.7 days per half-life ≈ 6.39 half-lives. The fraction remaining is (1/2)^6.39 ≈ 0.012, or 1.2%.

Cesium-131 Has a Half-Life of 9