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13. The 14C activity of some ancient Peruvian corn was found to be 10 disintegrations per minute per gram of carbon. If present-day activity shows

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13. The 14C activity of some ancient Peruvian corn was found to be 10 disintegrations per minute per gram of carbon. If present-day activity shows 15 dpm/g, how old is the Peruvian corn? The half-life of 14C is 5730 years. 3,820 y 1.910 yr 9,080 yr 3,350 YT 1.456 y

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