Cobalt-60 is a beta emitter with a half-life of 5.3 years. Approximately what fraction of cobalt-60 atoms will remain in a particular sample after 26.5 years

Name: Cobalt-60 is a beta emitter with a half-life of 5.3 years. Approximately what fraction of cobalt-60 atoms will remain in a particular sample after 26.5 years
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Quizplus · Accepted Answer

After 26.5 years, which is 5 half-lives (26.5 / 5.3 = 5), the fraction remaining is (1/2)^5 = 1/32.

Cobalt-60 Is a Beta Emitter with a Half-Life of 5