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The half-life of cobalt-60 is 5.26 years. If a sample originally contained 220 grams of this isotope, how many grams would be left after 10.52 years?
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The half-life of cobalt-60 is 5.26 years. If a sample originally contained 220 grams of this isotope, how many grams would be left after 10.52 years?

User Tim Knight
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The half-life of cobalt-60 is 5.26 years. How many half-lives have passed in 10.52 years? 2

12.5% of a radioactive sample are left. How many half-lives have passed? 3

After 3 half-lives, how much of a 400 gram sample of radioactive uranium remains? 50g

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User Martin
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