Question 1168494
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<pre>

The number of half-lives of the carbon-14 in 13000 years is this fraction/(ratio)


    {{{13000/5770}}} = 2.253.


So, there are 2.253 half-life periods in 13000 years.



The fraction of the original carbon-14 amount remaining after 13000 years is


    f = {{{(1/2)^2.253}}} = {{{0.5^2.253}}} = 0.210 (rounded).


Or, expressed as a percentage, 21%.
</pre>

Solved.


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