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A Rock Contains 0

Question 4

Multiple Choice

A rock contains 0.167 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) 7.52 × 108
B) 6.08 × 108
C) 7.95 × 108
D) 1.15 × 109
E) 8.77 × 108

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