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 0.412 is ________ y.
A) 1.62 × 109
B) 5.23 × 108
C) 7.55 × 108
D) 2.26 × 109
E) 6.32 × 108
Correct Answer:
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