College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 19

A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 1.00-kg sample of carbon from the wood has an activity equal to 5.00 × 10 2 decays per minute. Find the age of the charcoal. Hint: Living material has an activity equal to 15.0 decays/minute per gram of carbon present.