The C-14/C-12 ratio is used to date once-living organisms because C-12 is fixed value of any organisms but the value of C-14 is constantly decreasing by time and so every organism have their specific ratio of C14/C12 .
Carbon-12 and carbon-14 are two isotopes of the element carbon. The difference between carbon-12 and carbon-14 is the number of neutrons in each of their atoms.
Because of the different number of neutrons, carbon-12 and carbon-14 differ in terms of radioactivity. Carbon-12 is a stable isotope carbon-14, on the other hand, undergoes radioactive decay:
146C → 147N + 0-1e
C-12 is fixed value of any organisms but the value of C-14 is constantly decreasing by time and so every organism have their specific ratio of C14/C12 ,hence due to this reason the C-14/C-12 ratio used to date once-living organisms .
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