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A 1.00 g sample of carbon from wood at an archeological dig in Arizona gave 7900...

A 1.00 g sample of carbon from wood at an archeological dig in Arizona gave 7900 disintegrations in a period of 20 hours. In the same period, 1.00 g of wood from a modern source underwent 18,400 disintegrations. About how old is the sample, to two significant figures? (The half-life of C–14 is 5730 years.)

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