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Which one of the following statements is incorrect ? (a) Every living organism takes C - 14 through carbon. (b) Every living being has the same proportion of carbon 14. (c) After death every living organ throws same percentage of carbon. (d) After 5568 yrs of death half of C - 14 will disappear - which is called as half life of Carbon - 14. (e) The method is used to get chronological evidence of archaeological remain. (f) This method was invented by F.W. Liby. (g) He got Nobel prize in physics for this work.

Which one of the following statements is incorrect ? (a) Every living organism takes C - 14 through carbon. (b) Every living being has the same proportion of carbon 14. (c) After death every living organ throws same percentage of carbon. (d) After 5568 yrs of death half of C - 14 will disappear - which is called as half life of Carbon - 14. (e) The method is used to get chronological evidence of archaeological remain. (f) This method was invented by F.W. Liby. (g) He got Nobel prize in physics for this work. Correct Answer (g)

The correct answer is (g).

Key Points

  • Carbon-14 (14C), or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.
  • Its presence in organic materials is the basis of the radiocarbon dating method pioneered by Willard Libby.
    • Radiocarbon dating is a radiometric dating method that uses (14C) to determine the age of carbonaceous materials up to about 60,000 years old. Hence, statements b & d are correct
    • The technique was developed by Willard Libby and his colleagues in 1949 during his tenure as a professor at the University of Chicago. Hence, statement f is correct
    • Libby was awarded the Nobel Prize in chemistry for this work. Hence statement g is wrong.
  • 14C is also used in climate studies, biomedicine applications, and many other fields.
  • Basic Principles of Carbon Dating
    • ​Radiocarbon (carbon 14) is an isotope of the element carbon that is unstable and weakly radioactive. The stable isotopes are carbon 12 and carbon 13. 
    • Carbon 14 is unstable and carbon 12 is stable, thus, with an increase in age the ratio of 14C to 12C changes continuously for dead bodies or plants. Hence, statement d is correct 
    • Carbon 14 is continually being formed in the upper atmosphere by the effect of cosmic ray neutrons on nitrogen 14 atoms.
    • It is rapidly oxidized in air to form carbon dioxide and enters the global carbon cycle.
    • Plants and animals assimilate carbon 14 from carbon dioxide throughout their lifetimes. Hence, statement a is correct
    • When they die, they stop exchanging carbon with the biosphere and their carbon 14 content then starts to decrease at a rate determined by the law of radioactive decay.

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