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A sample of wood that originally contained 100 grams of carbon-14 now contains only 25 grams of carbon-14. approximately how many years ago was this sample part of a living tree?
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A sample of wood that originally contained 100 grams of carbon-14 now contains only 25 grams of carbon-14. approximately how many years ago was this sample part of a living tree?

User Brock Hargreaves
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In order for 100 grams of Carbon 14 to decay to 25 grams, 2 half lives worth of time would have passed.

log(100/25) / log(2) = 2 half lives

2 * 5730 years = 11,460 years
User GrahamS
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