# Biology

The half life of carbon 14 is 5700 years. If the carbon 14 level measured in a fossilized bone has only 1/4 of the original amount, how old in the bone?

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1. 8550

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posted by Hart
2. 50% 1/2 = 5700 (one half life)

25% 1/4 = 5700 x 2 (two "half life"s)

Therefore, after two complete half life cycles, there will be only 1/4 of the original amount.

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3. 1425

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posted by nicky

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