If a radioactive isotope has a one year halflife, what fraction will remain after 5 years?
A) None
B) Half
C) 1/32
D) 1/5 [one fifth]
E) 1/64

Name: If a radioactive isotope has a one year halflife, what fraction will remain after 5 years? A) None B) Half C) 1/32 D) 1/5 [one fifth] E) 1/64
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Question

Quizplus · Accepted Answer

After 5 years, the isotope will have gone through 5 half-lives. Each half-life reduces the remaining amount by half, so (1/2)^5 = 1/32 of the original amount will remain.

If a Radioactive Isotope Has a One Year Halflife, What