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

Question 142

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 0.330 is ________ yr.


A) 3.85 × 109
B) 1.77 × 109
C) 2.55 × 109
D) 3.62 × 108
E) 5.23 × 108

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