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Author Question: Charcoal found under a stone at Stonehenge, England, has a carbon-14 activity that is 0.60 that of ... (Read 72 times)

desireelg_7

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on: Nov 5, 2023

Question 1

Carbon-11 is a radioactive isotope of carbon.  Its half-life is 20.3 minutes.  What fraction of the initial number of carbon-11 atoms in a sample will remain after 81 minutes?
◦ 1/16
◦ 1/4
◦ 1/2
◦ 1/32
◦ 1/8

Question 2

Charcoal found under a stone at Stonehenge, England, has a carbon-14 activity that is 0.60 that of new wood. How old is the charcoal? (The half-life of carbon-14 is 5,730 years.)
◦ Less than 5,730 yr
◦ Between 5,730 and 11,460 yr
◦ Between 11,460 and 17,190 yr
◦ More than 17,190 yr
Chemistry ¦ Chang, Goldsby ¦ 11th Edition
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Marked as best answer by desireelg_7 on Nov 5, 2023

gyvette

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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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desireelg_7

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Reply 2 on: Nov 5, 2023
Excellent

samiel-sayed

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

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