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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 43 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
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nanna

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Reply 2 on: Nov 5, 2023
YES! Correct, THANKS for helping me on my review

skipfourms123

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Reply 3 on: Yesterday
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