Arianna finds some fossil bones while digging in her backyard. Could they be dinosaur bones? Using carbon dating, she determines that 3% of the original radioactive carbon-14 is still radioactive. (The rest has decayed to nitrogen-14.)
Approximately how many half-lives have occurred?:5
The half-life of carbon-14 is 5,730 years. This means that the animal died approximately years ago.:28,650