Reference no: EM133561926
Question 1. A mineral forms with 100 atoms of isotope A. After 5 half-lives, how many atoms of isotope A remain?
Question 2. A mineral forms with 1,000 atoms of isotope K. I analyze the mineral some time later and find 125 atoms of isotope K and 875 atoms of the daughter isotope L. How many half-lives have past? (Assume that the mineral does not "leak" any atoms.)
Question 3. I have measure the half-life of isotope Y to be 10,000 years. I then analyze a mineral and find 31 atoms of isotope Y and 469 atoms of the daughter element, isotope Z. How many half-lives have past? How old is the mineral? (Assume that the mineral does not "leak" any atoms.)
Question 4. I have collected some volcanic rocks and would like to use radiometric dating to determine their age. I choose to use carbon-14. Is this a wise choice on my part? Can you use carbon-14 to date volcanic rocks? Why or why not? Explain your answer.
Question 5. If I have a pretty good intuition that my volcanic rocks were formed less than 5 million years ago, could I use thorium-lead isotopes to date them? Why or why not? 6. I have gathered three samples from an archeological dig near the Kansas River. The samples are charcoal collected from ancient fire rings and have been removed from three different layers in the soil. Analysis of isotopes of carbon-14 yielded ages for the three samples as: Sample R: 1,565 years Sample H: 10,340 years Sample C: 4,780 years Which sample was likely collected from the bottom most layer? How do you know? 7. I assumed the charcoal from the site was collected from a fire ring and were therefore evidence of human activity. However, that may not necessarily be the case. What are some other possible sources of charcoal that may not be human related? What other lines of evidence would you look for to be sure of early human habitation at this site? 8. Pieces of organic wood have been collected from permafrost deposits in Alaska that are Pliocene in age. Can I use carbon-14 dating to determine the ages of the wood? Why or why not?
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How many atoms of isotope a remain
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