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Author Question: A rock contains 0.313 mg of lead-206 for each milligram of uranium-238. The for the decay of ... (Read 188 times)

future617RT

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on: Jul 8, 2021

Question 1

A nuclide has a decay constant of 4.28 × 10-4/h. If the activity of a sample is 3.14 × 105/s, how many atoms of the nuclide are present in the sample?
◦ 7.34 × 108
◦ 2.64 × 1012
◦ 4.84 × 105
◦ 1.34 × 102
◦ 2.34 × 1011

Question 2

A rock contains 0.313 mg of lead-206 for each milligram of uranium-238. The for the decay of uranium-238 to lead-206 is 4.5 × 109 y. The rock was formed ________ y. ago.
◦ 1.41 × 109
◦ 1.08 × 109
◦ 1.39 × 109
◦ 2.00 × 109
◦ 1.56 × 109
General Chemistry: Principles and Modern Applications ¦ Petrucci, Herring, Madura, Bissonnette ¦ 11th Edition
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Marked as best answer by future617RT on Jul 8, 2021

fffftttt

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Reply #1 on: Jul 8, 2021
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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future617RT

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Reply 2 on: Jul 8, 2021
Wow, this really help

jackie

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Reply 3 on: Yesterday
Excellent

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