Q90 / 120 · VITEEE 2007 · Physics

Radio carbon dating is done by estimating in specimen

A
the amount of ordinary carbon still present
B
the amount of radio carbon still present
Correct answer
C
the ratio of amount of ${ }^{14} \mathrm{C}_{6}$ to ${ }^{12} \mathrm{C}_{6}$ still present
D
the ratio of amount of ${ }^{12} \mathrm{C}_{6}$ to ${ }^{14} \mathrm{C}_{6}$ still present

Solution

Radio carbon dating is done by measuring ratio of ${ }^{14} \mathrm{C}$ present in the sample, since proportion of $^{14} \mathrm{C}$ and $^{12} \mathrm{C}$ in a body is same; but after death ${ }^{14} \mathrm{C}$ decays. Hence knowing the present ratio of $^{14} \mathrm{C}$ to ${ }^{12} \mathrm{C}$, sample can be dated.

Hence, the correct answer is option: 'C'.

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