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Author Question: A geological sample is found to have a Pb-206/U-238 mass ratio of 0.337/1.00. Assuming there was no ... (Read 97 times)

james0929

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on: Nov 18, 2019

Question 1

Determine the half-life of a nuclide that loses 38.0% of its mass in 387 hours.
◦ 748 hours
◦ 277 hours
◦ 639 hours
◦ 561 hours
◦ 455 hour

Question 2

A geological sample is found to have a Pb-206/U-238 mass ratio of 0.337/1.00. Assuming there was no Pb-206 present when the sample was formed, how old is it? The half-life of U-238 is 4.5 × 109 years.
◦ 1.4 × 1010 years
◦ 2.4 × 1010 years
◦ 7.1 × 109 years
◦ 2.1 × 109 years
◦ 7.3 × 1011 years
Chemistry: A Molecular Approach (Canadian) ¦ Tro, Fridgen, Shaw ¦ 2nd Edition
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Marked as best answer by james0929 on Nov 18, 2019

lou

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Reply #1 on: Nov 18, 2019
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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james0929

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Reply 2 on: Nov 18, 2019
Great answer, keep it coming :)

juliaf

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

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