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A Rock Contains 0

Question 49

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A rock contains 0.153 mg of lead-206 for each milligram of uranium-238.The A rock contains 0.153 mg of lead-206 for each milligram of uranium-238.The for the decay of uranium-238 to lead-206 is 4.5 × 10<sup>9</sup> yr.The rock was formed ________ years ago. A) 6.89 × 10<sup>8</sup> B) 5.60 × 10<sup>8</sup> C) 7.33 × 10<sup>8</sup> D) 1.06 × 10<sup>9</sup> E) 8.08 × 10<sup>8</sup> for the decay of uranium-238 to lead-206 is 4.5 × 109 yr.The rock was formed ________ years ago.


A) 6.89 × 108
B) 5.60 × 108
C) 7.33 × 108
D) 1.06 × 109
E) 8.08 × 108

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