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The following are modified from Activity 84 5 You find an.pdf

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The following are modified from Activity 8.4: 5. You find an ancient lava flow that contains zircon crystals. A mass spec was used to count the uranium-235 and lead-207 (235U and 207Pb) isotopes in the zircon grains. The analysis revealed 71% were 235U and 29% were 207Pb. a. If 235U decays to 207Pb, how many half-lives have elapsed since the zircon mineral formed? b. What is the numerical age of the lava flow based on the zircon crystals?.

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The following are modified from Activity 8.4: 5. You find an ancient lava flow that contains zircon crystals. A mass spec was used to count the uranium-235 and lead-207 (235U and 207Pb) isotopes in the zircon grains. The analysis revealed 71% were 235U and 29% were 207Pb. a. If 235U decays to 207Pb, how many half-lives have elapsed since the zircon mineral formed? b. What is the numerical age of the lava flow based on the zircon crystals?

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The following are modified from Activity 84 5 You find an.pdf

  • 1. The following are modified from Activity 8.4: 5. You find an ancient lava flow that contains zircon crystals. A mass spec was used to count the uranium-235 and lead-207 (235U and 207Pb) isotopes in the zircon grains. The analysis revealed 71% were 235U and 29% were 207Pb. a. If 235U decays to 207Pb, how many half-lives have elapsed since the zircon mineral formed? b. What is the numerical age of the lava flow based on the zircon crystals?