College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 43

After a plant or animal dies, its 14 C content decreases with a half-life of 5 730 yr. If an archaeologist finds an ancient fire pit containing partially consumed firewood and the 14 C content of the wood is only 12.5% that of an equal carbon sample from a present-day tree, what is the age of the ancient site