The half life is the time taken for only one of the half of the radioactive substance to remain.
What is half life?
The half life is the time taken for only one of the half of the radioactive substance to remain. We can see the half life by looking at the graph and observing the point at which the sample decreases to half its original number.
Since the half life of carbon-14 is 5700 years, after ten half lives, almost 60000 years has elapsed thus there is little or no carbon-14 left. As a result of this carbon-14 can not be used if the sample is over 60000 years old.
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