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NAEP Science Grade 12

Category - Science

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Carbon-14 has a half-life of approximately 5,700 years. Analysis of the carbon in a piece of charred wood found in an excavation revealed that the carbon has 25 percent of the amount of carbon-14 that is found in the carbon of living trees. Which of the following is most nearly the age of the excavated wood?

160 years
5,700 years
11,400 years
23,000 years

Explanation

Answer: C - 11,400 years

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