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scientists can determine the age of somthing by finding out how much carbin 14 there is left in the sample. the reason fro using carbon 14 is because it has a very predictable half life of 5730(plus or minus 40) years. half life is the decay rate of certain materials. by knowing the begging amount of carbon 14 present in the sample they can determine by the amount left how old it is.

this is a pretty easy subject to look up if you have any pther questions.

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