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 y. The rock was formed ________ y. ago.
A) 1.41 × 109
B) 1.08 × 109
C) 1.39 × 109
D) 2.00 × 109
E) 1.56 × 109
Correct Answer:
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