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A Rock Contains 0

Question 102

Multiple Choice

A rock contains 0.313 mg of lead-206 for each milligram of uranium-238.The half-life for the decay of uranium-238 to lead-206 is 4.5 × 109 yr.The rock was formed ________ years ago.


A) 1.41 × 109
B) 1.08 × 109
C) 1.39 × 109
D) 2.00 × 109
E) 1.56 × 109

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