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

Question 10

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

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