# How old is a fossil that has radioactively decayed through 4 half-lives of carbon-14?

##### 1 Answer

Sep 2, 2017

#### Answer:

#### Explanation:

Carbon-14 has a half life of 5730 years. This means it takes 5730 years for half of the carbon-14 atoms to decay to carbon-12 in a given sample (eg: 100 carbon-14, one half life = 50 carbon-14, 50 carbon-12).

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