The isotope ²¹⁰Pb has a half-life of 22 years.What percentage of a pure ²¹⁰Pb sample prepared in April 1937 remains in April 1994?

Name: The isotope 210 Pb has a half-life of 22 years.What percentage of a pure 210 Pb sample prepared in April 1937 remains in April 1994?
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Quizplus · Accepted Answer

The time from April 1937 to April 1994 is 57 years. The number of half-lives is 57/22 = 2.59. The remaining percentage is (1/2)^2.59 ≈ 0.17 or 17%.

The Isotope 210Pb Has a Half-Life of 22 Years

The Isotope ²¹⁰Pb Has a Half-Life of 22 Years