What percentage of a radioactive substance remains after 6.00 half-lives have elapsed?

Name: What percentage of a radioactive substance remains after 6.00 half-lives have elapsed?
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Question

Quizplus · Accepted Answer

After each half-life, the amount of radioactive substance remaining is halved. After 6 half-lives, the amount remaining is halved six times, or reduced to 1/2^6 (or 1/64) of the original amount, which is about 1.56%. Therefore, the answer is B, 1.56%.

What Percentage of a Radioactive Substance Remains After 6