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American InterContinental University, Atlanta *

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106B

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Anthropology

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Oct 30, 2023

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docx

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Half-life Number Number of Nuclei in the Sample Number of Nuclei in the Sample That Have Decayed start 100 0 1 53 47 2 25 28 3 10 15 4 6 4 5 1 5 6 0 1 7 0 0 8 0 0 9 0 0 10 0 0 11 0 0 12 0 0 1. Graph the “Number of Nuclei in the Sample” versus the “Half-life Number.” If the sample has 1/8 of the radioactive nuclei left, how many half-lives would the sample have gone through? 12.5. 3 half lives 2. Each time you dumped the pennies, one half-life passed; it has been shown that the half-life for this radioactive isotope is 20 years. In the year 2000, an archaeology team unearths pottery and is using this isotope for radiometric dating to place the age of the pottery. It is shown that 95% of the nuclei have decayed. Using your graph, approximately how long ago was the pottery made? 100 years ago

3. While investigating the half-life of a radioactive isotope, the following data was gathered. Graph the data; this graph should resemble the graph from your lab. Notice that you have a y-value at x = 0. This is called a decay curve. Answer the following questions: Time (hr) Mass Remaining of the Isotope (g) 0.0 40.00 3.0 20.00 6.0 10.00 9.0 5.00 12.0 2.50 15.0 1.25 18.0 0.63 A. Approximately how much mass remains after 8.0 hours? 6.66 remains B. Approximately how much mass remains after 21.0 hours? .351 C. What is the half-life for this isotope? 3 hours

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