7.16 Radioactivity Dating Lab.docx - Half-Life Number...

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Half-Life Number Number of Nuclei in the Sample Number of Nuclei in the Sample That Have Decayed Start 200 0 1 200 86 2 144 54 3 90 61 4 29 13 5 16 3 6 13 7 7 6 1 8 5 3 9 2 1 10 1 0 11 1 1 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? 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
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