Agricultural Botany Department: Comparative Biology 1 ABT 202 (Practical) - Carbon Dating
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What is used to determine the age of ancient objects in radio carbon dating?

  • Amount of carbon-13 isotopes present in the object
  • Amount of carbon-12 isotopes left in the object
  • Amount of carbon-12 and carbon-14 isotopes combined in the object
  • Amount of carbon-14 isotopes left in the object (correct)

    • Which type of atom of carbon is radioactive and used in measuring age in carbon dating?

  • Carbon-12 and Carbon-13
  • Carbon-12
  • Carbon-13
  • Carbon-14 (correct)

    • What is the main reason why carbon-14 is used in carbon dating?

  • It has a longer half-life compared to carbon-12 and carbon-13
  • It makes up a higher percentage of an atom than carbon-12 and carbon-13
  • It is non-radioactive and remains stable over time
  • It is radioactive and undergoes decay at a known rate over time (correct)

    • If an object originally had 800 carbon-14 atoms and now has 200, how many half-lives have passed?

    <p>3 half-lives</p> Signup and view all the answers

    Why does the number of remaining carbon-14 atoms help determine the age of an object?

    <p>It allows calculation based on the original number of carbon-14 atoms and the half-life</p> Signup and view all the answers

    What assumption is necessary when guessing how many carbon-14 atoms something had before it died?

    <p>It had the same amount of carbon-14 as the same living organism today.</p> Signup and view all the answers

    What is used to date very ancient geological events that need measurements in millions or billions of years?

    <p>Uranium isotopes</p> Signup and view all the answers

    In a carbon dating example where an isotope material had 1000 atoms in the year 2000, how many atoms would be present in 2030 given a half-life of 10 years?

    <p>125 atoms</p> Signup and view all the answers

    If a bean seed initially had 100 carbon-14 atoms, what is the age of a seed with 25 carbon-14 atoms found in two different places?

    <p>8595 years ago</p> Signup and view all the answers

    What is the reason for using potassium or uranium isotopes instead of carbon-14 dating for very ancient geological events?

    <p>Carbon-14 has a shorter half-life than potassium or uranium isotopes.</p> Signup and view all the answers

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