Carbon-13 is a radioactive isotope. About half of a sample decays in 6,000 years. After how long would only 1/8 of the original carbon 13 be left?
A. 30,000 years
B. 18,000 years
C. 24,000 years
D. 12,000 years
E. 6,000 years
Answer: B
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Fill in the blank(s) with the appropriate word(s).
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Fill in the blank(s) with the appropriate word(s).