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Question 78

Multiple Choice

A rock contains 0.413 mg of lead-206 for each milligram of uranium-238. The A rock contains 0.413 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> y. The rock was formed ________ y. ago. A) 4.80 × 10<sup>9</sup> B) 1.86 × 10<sup>9</sup> C) 3.10 × 10<sup>9</sup> D) 7.34 × 10<sup>9</sup> E) 2.53 × 10<sup>9</sup> for the decay of uranium-238 to lead-206 is 4.5 × 109 y. The rock was formed ________ y. ago.


A) 4.80 × 109
B) 1.86 × 109
C) 3.10 × 109
D) 7.34 × 109
E) 2.53 × 109

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