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Author Question: What percentage of a radioactive substance remains after 6.00 half-lives have elapsed? (Read 143 times)

joe

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on: Feb 15, 2020

Question 1

Neptunium-239 has a half-life of 2.35 days. How many days must elapse for a sample of 239Np to decay to 3.00% of its original quantity?
◦ 0.0841 days
◦ 1.03 days
◦ 0.967 days
◦ 11.9 days

Question 2

What percentage of a radioactive substance remains after 6.00 half-lives have elapsed?
◦ 0.781%
◦ 3.12%
◦ 6.25%
◦ 1.56%
Chemistry ¦ McMurry, Fay, Robinson ¦ 7th Edition
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Marked as best answer by joe on Feb 15, 2020

lorealeza77

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Reply #1 on: Feb 15, 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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joe

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Reply 2 on: Feb 15, 2020
Thanks for the timely response, appreciate it

ryhom

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Reply 3 on: Yesterday
Wow, this really help

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