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Author Question: Rubidium87 decays by beta decay with a half-life of 4.9 1010 yr. How many 87Rb atoms are in a moon ... (Read 35 times)

Caileynorton

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on: Nov 5, 2023

Question 1

Radium-226 decays by alpha emission.  What is its decay product?
◦ Fr
◦ Rn
◦ Th
◦ Ac
◦ Po

Question 2

Rubidium–87 decays by beta decay with a half-life of 4.9 × 1010 yr.  How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3,500 disintegrations per hour?
◦ 9.0 × 1016 atoms
◦ 4.3 × 10–4 atoms
◦ 2.2 × 1018 atoms
◦ 2.5 × 1014 atoms
◦ 1.7 × 1014 atoms
Chemistry ¦ Chang, Goldsby ¦ 11th Edition
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Marked as best answer by Caileynorton on Nov 5, 2023

bleep bloop

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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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Caileynorton

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Reply 2 on: Nov 5, 2023
Wow, this really help

xiaomengxian

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Reply 3 on: Yesterday
Gracias!

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