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 0.712 is __________ yr.
A) 1.78 × 109
B) 1.11 × 109
C) 1.61 × 109
D) 6.83 × 108
E) 9.85 × 108
Correct Answer:
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