A) \[{{U}^{238}}\]
B) \[{{U}^{235}}\]
C) \[P{{o}^{235}}\]
D) \[^{12}C\]
Correct Answer: A
Solution :
Fossils are the material remains (bones, teeth, shells) or traces (physical or chemical) of ancient organisms. They can be studied under Palaeontology. The age of the fossils can be determined by many methods? [a] Radio carbon dating [b] Potassium argon (40K/40 Ar) and Argon argon (40 Ar/39 Ar) dating. [c] Uranium series dating [d] Fission track dating [e] Luminescence dating Radioactive clock method?This metho was discovered by Bolt-wood (1907) and based on the disintegrating property of radioactive elements. These elements disintegrate at a steady rate into stable substance for example in \[{{U}^{238}}-P{{b}^{206}}\] method following decay takes place \[{{U}^{238}}\to R{{a}^{226}}\to P{{o}^{218}}\to Astatin{{e}^{218}}\to P{{o}^{210}}\] \[\to P{{b}^{206}}\] One half of \[{{U}^{238}}\] atoms will convert into \[P{{b}^{206}}\] after 4.5 billion year (\[4.5\times {{10}^{10}}\] year).
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