After three half-lives have elapsed, what fraction of the original amount of radionuclide remains?

Question

Quizplus · Accepted Answer

After one half-life, half of the radionuclide remains (1/2). After two half-lives, half of that amount remains (1/2 * 1/2 = 1/4). After three half-lives, half of the remaining amount after two half-lives remains (1/4 * 1/2 = 1/8). Therefore, 1/8 of the original amount of radionuclide remains after three half-lives.

After Three Half-Lives Have Elapsed, What Fraction of the Original