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Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the C...
Part D A fossil was analyzed and determined to have a carbon-14 level that is 30 % that of living organisms. The half-life of C-14 is 5730 years. How old is the fossil? Express your answer with the appropriate units. View Available Hint(s) μΑ ? t = Value Units
1. The dosage of technetium-99m for a lung scan is 20. μCi /kg of body mass. How many millicuries of technetium-99m should be given to a 54 kg person? (Recall that 1 mCi = 1000 μCi.) Express the radiation dose in millicuries to two significant figures. 2. Suppose a person absorbed 46 mrad of alpha radiation. What would be the equivalent dose in millirems? Express the biological damage in millirems to two significant figures. 3. Carbon-14 has a half-life of...
1. The half-life of carbon-14 is 5730 years. A sample is found to have one-eighth the original amount of carbon-14 in it. How old is the sample? 5730 years, 716 years, 45800 years, 17200 years 2. Why wouldn't you use carbon-14 dating on a piece of shell that was estimated to be 1 million years old? Sea shells do not have radioisotopes, carbon dating is only useful on plants, uranium dating is better for items older than 1/2 million years,...
The half-life of carbon-14 is 5730 years. How long does it take for 3.6 grams of carbon-14 to be reduced to 1.3 grams of carbon-14 by radioactive decay? years (Do not round until the final answer. Then round to the nearest hundredth as needed.)
B) An unknown radioactive substance has a half-life of 3.20 hours. If 47.3 g of the substance is currently present, what mass A0 was present 8.00 hours ago? Express your answer with the appropriate units. C) Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 30.0 % of an Am-241 sample to decay? Express your answer with the appropriate units. D) A fossil...
If carbon-14 has a decay half-life of 5730 years, what fraction of the original carbon-14 would you expect to remain intact in a 3000 year old parchment scroll, and why?
This Question: 1 pt 20 of 20 (15 complete The half-life of carbon-14 is 5730 years. How long does it take for 2.2 grams of carbon-14 to be reduced to 0.2 grams of carbon-14 by radioactive decay? (Do not round until the final answer. Then round to the nearest hundredth as needed.) Enter your answer in the box
researchers find a fossil of a large ma Researchers find a fossil of a large mammal that contains one-sixteenth the amount of carbon-14 that is preset in living organisms. Using carbon-14 dating, about how old is this fossil? Recall that carbon-14 has a half-life 01 5730 years. 11,460 years 17,190 years 22,920 years 91.680 years
Carbon-14 has a half-life of about 5730 years. If a sample from an archaeological site has only 12.5% of the normal C-14 abundance, it must be ___ years old.
7.2.47 The half-life of carbon-14 is 5730 years. A frozen human mummy was discovered in a glacier. It was estimated that this human died 5100 years before he was discovered in the melting glacier. How much of the original carbon-14 remained in the mummy at the time of his discovery? The frozen human has about % of the carbon-14 expected in living matter.