Potassium-40 Decays to Argon-40 with a Half-Life of 1

question 6

Multiple Choice

Potassium-40 decays to argon-40 with a half-life of 1.27 × 10⁹ yr.The age of a mineral sample that has a mass ratio of ⁴⁰Ar to ⁴⁰K of 0.812 is ________ yr.

• A) 1.56 × 10⁹
• B) 1.02 × 10⁹
• C) 1.47 × 10⁹
• D) 7.55 × 10⁸
• E) 1.09 × 10⁹

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