The remnants of an ancient fire in a cave in africa showed a 146C decay rate of 3.9 counts per minute per grams of carbon. if the decay rate in C-14 in freshly cut wood, is 13.6 counts per mintue per gram of carbon, how many years ago did the campfire occur?
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The remnants of an ancient fire in a cave in africa showed a 146C decay rate of 3.9 counts per minute per grams of carbon. if the decay rate in C-14 in freshly cut wood, is 13.6 counts per mintue per gram of carbon, how many years ago did the campfire occur?
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- How long does it take for approximately 75% of carbon-14 to decay into carbon-12 (in thousands of years)?Phosphorus-32, a radioisotope used in leukemia therapy, has a half-life of about 14 days. Approximately what percentage of a sample remains after eight weeks?Some dried beans with a 14C/12C ratio one-eighth of the current value are found in an old cave. How old are the beans?
- A 10.00 mg sample of technetium-93 (92.91024898 u) is used to heat 125.4 g of water from 23.4 degree C to 87.4 degree C. How many minutes will be required to heat the water if all of the energy generated from the decay is used to heat the water?Explain how the type of decay, the half life and the chemical properties make the following radionuclides suitable for the given applications: A single gram of polonium will reach a temperature of 500°C making it useful as a source of heat for space equipment (α emitter, half lives of polonium isotopes range from less than a second to 200 years).Define the following terms: a. radiationless decay b. P700 c. P680 d. c = λv e. UV
- The decay of an isotope element follows a first-order reaction. Assuming that you start with 964 mg of the isotope element sample, after 39.4 hours of decay, you find that there is 275 mg of the sample remaining. What is the half-life time of this reaction?What characteristic of uranium-235 fission causes a chain reaction?What does it mean when we say that strontium-90, a waste product of nuclear power plants, has a half-life of 28.8 years?