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Author Question: The Rb-87/Sr-87 method of dating rocks is often used by geologists: t1/2 = 6.0 1010 yrEstimate ... (Read 48 times)

hgjjghgjh

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on: Nov 5, 2023

Question 1

The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 109 yr.  A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms.  The age of the rock is
◦ 8.1 × 10–10 yr
◦ 2.4 × 109 yr
◦ 2.8 × 109 yr
◦ 4.6 × 109 yr
◦ 6.8 × 109 yr

Question 2

The Rb-87/Sr-87 method of dating rocks is often used by geologists:
           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.
◦ 2.4 × 109 yr
◦ 1.7 × 109 yr
◦ 3.1 × 1011 yr
◦ 4.1 × 10–11 yr
◦ 3.6 × 1011 yr
Chemistry ¦ Chang, Goldsby ¦ 11th Edition
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Marked as best answer by hgjjghgjh on Nov 5, 2023

reason44

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Reply #1 on: Nov 5, 2023
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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hgjjghgjh

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Reply 2 on: Nov 5, 2023
Thanks for the timely response, appreciate it

xiazhe

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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