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Author Question: A sample of a radioisotope shows an activity of 999 disintegrations per minute due to beta decay. If ... (Read 46 times)

nanna

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on: Nov 5, 2023

Question 1

A rock contains 0.37 mg of Pb-206 and 0.95 mg of U-238.  The half-life of the decay series U-238 → Pb-206 is 4.5 × 109 yr.  Assuming no Pb-206 was present in the rock initially, how old is the rock?
◦ 1.7 × 109 yr
◦ 5.2 × 109 yr
◦ 2.7 × 106 yr
◦ 4.5 × 109 yr
◦ 2.4 × 109 yr

Question 2

A sample of a radioisotope shows an activity of 999 disintegrations per minute due to beta decay.  If after 1.10 years the activity is 952 disintegrations per minute, what is the half-life of this radioisotope?
◦ 4.38 × 10–2 yr
◦ 11.4 yr
◦ 0.25 yr
◦ 15.8 yr
◦ 9.1 yr
Chemistry ¦ Chang, Goldsby ¦ 11th Edition
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Marked as best answer by nanna on Nov 5, 2023

Jaclyn92G6

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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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nanna

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Reply 2 on: Nov 5, 2023
:D TYSM

marict

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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