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28 August, 18:47

A fossil was found and determined by radiometric dating to be 11,400 years old. what is the ratio of carbon-14 to carbon-12 in this fossil compared to its environment?

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  1. 28 August, 18:49
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    The answer would be 25%

    Carbon 14 is radioactive material with 5700 year of half-time which will change it into carbon-12, a more stable substance. If the age of the fossil is 11,400 years old, then the amount of half-time passed would be: 11,400 years / (5,700years / half-time) = 2 half-time.

    Since it undergo 2 half-time, the percentage should be: 100% * (1/2) ^2 = 25%
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