A rock contains 0.112 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 ________ yr ago.
A) 5.04 × 108
B) 4.17 × 108
C) 5.48 × 108
D) 7.90 × 108
E) 6.01 × 108
Correct Answer:
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