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Isotope used in archaeological dating

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A. The half-life of carbon-14, an isotope used in archaeological dating, is 5730 years. What percentage of 14 6Cremains in a sample estimated to be 11,500 years old?(Express your answer using one decimal place). ____ %?B. A ?-emitting radiation source gives 250 units of radiation at a distance of 2.8 m. At what distance does the radiation drop to one-tenth its original value?(Express your answer using two significant figures). d= _____ m?

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