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Author Question: Potassium-40 decays to argon-40 with a half-life of 1.27 109 yr. The age of a mineral sample that ... (Read 72 times)

Zoey63294

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on: Nov 18, 2019

Question 1

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 × 109 y. The rock was formed ________ y. ago.
◦ 4.80 × 109
◦ 3.10 × 109
◦ 2.53 × 109
◦ 7.34 × 109
◦ 1.86 × 109

Question 2

Potassium-40 decays to argon-40 with a half-life of 1.27 × 109 yr. The age of a mineral sample that has a mass ratio of 40Ar to 40K of 0.412 is ________ y.
◦ 2.26 × 109
◦ 1.62 × 109
◦ 7.55 × 108
◦ 6.32 × 108
◦ 5.23 × 108
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Marked as best answer by Zoey63294 on Nov 18, 2019

Chou

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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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Zoey63294

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Reply 2 on: Nov 18, 2019
Wow, this really help

zacnyjessica

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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