Carbon-14 is only effective in dating an object up to approximately 10 half-lives. The reason is that the speed with which C-14 decays increases after 10 half-lives.

Question

Quizplus · Accepted Answer

The speed of C-14 decay does not increase after 10 half-lives; rather, the amount of C-14 becomes too small to measure accurately, making it ineffective for dating beyond this point.

Carbon-14 Is Only Effective in Dating an Object Up to Approximately