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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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