If a radioactive element has a half-life of 10,000 years,what fraction of it is left in a rock after 40,000 years?
A) one-half
B) one-fourth
C) one-eighth
D) one-sixteenth

Name: If a radioactive element has a half-life of 10,000 years,what fraction of it is left in a rock after 40,000 years? A) one-half B) one-fourth C) one-eighth D) one-sixteenth
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Question

Quizplus · Accepted Answer

After 40,000 years, which is four half-lives (40,000 / 10,000 = 4), the fraction of the radioactive element left would be (1/2)^4 = 1/16.

If a Radioactive Element Has a Half-Life of 10,000 Years,what