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A Rock Contains 0

Question 9

Multiple Choice

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


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

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