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Author Question: The decay of 40K has a half of 1.3 109 years. The age of Earth is estimated at 4.6 109 years. The ... (Read 263 times)

jace

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on: Feb 28, 2020

Question 1

Which radioactive decay used for radiometric dating is not an isotope that was generated during nuclear synthesis in the star that went supernova and its products became our solar system?
◦ 14C
◦ 40K
◦ 147Sm
◦ 238U

Question 2

The decay of 40K has a half of 1.3 × 109 years. The age of Earth is estimated at 4.6 × 109 years. The decay of 40K is a major heat source for Earth's interior. Relative to today, how much more heat was produced by 40K in the early Archaeon era or 3.9 × 109 years ago?
◦ 8x
◦ 4x
◦ 6x
◦ 2x
Earth Science ¦ Tarbuck, Lutgens, Tasa ¦ 15th Edition
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Marked as best answer by jace on Feb 28, 2020

Qarqy

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Reply #1 on: Feb 28, 2020
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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Rob Conde

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Reply #2 on: Mar 15, 2022
thanks


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