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The Rb-87/Sr-87 Method of Dating Rocks Is Often Used by Geologists

Question 71

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The Rb-87/Sr-87 method of dating rocks is often used by geologists: The Rb-87/Sr-87 method of dating rocks is often used by geologists: t<sub>1/2</sub> = 6.0 × 10<sup>10 </sup>yr Estimate the age of a rock sample in which the present-day mole ratio of Rb-87 to Sr-87 is 36:1. A) 2.4 × 10<sup>9</sup> yr B) 1.7 × 10<sup>9</sup> yr C) 3.1 × 10<sup>11</sup> yr D) 4.1 × 10<sup>-11</sup> yr E) 3.6 × 10<sup>11</sup> yr t1/2 = 6.0 × 1010 yr Estimate the age of a rock sample in which the present-day mole ratio of Rb-87 to Sr-87 is 36:1.


A) 2.4 × 109 yr
B) 1.7 × 109 yr
C) 3.1 × 1011 yr
D) 4.1 × 10-11 yr
E) 3.6 × 1011 yr

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