A picture supposedly painted by Vermeer (1632-1675) contains 99.5% of its carbon-14 (half-life of 5730 years). 1. Is this enough information to determine if the picture is a fake? 2. What is the strategy for attacking the problem?
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A picture supposedly painted by Vermeer (1632-1675) contains 99.5% of its carbon-14 (half-life of 5730 years).
1. Is this enough information to determine if the picture is a fake?
2. What is the strategy for attacking the problem?
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- The half-life of radium-226 is 1.6 x 10 years. How long will it take for 20.0 mg of radium-226 to decay to 2.50 mg? 1.3 x 103 1.6 x 10' years A. years B. 3.2 x 10 years 103 С. D. 4.8 x years3D. Write the equation for the alpha decay of Thorium-232. b) Write the element that is formed in the alpha decay of Thorium-232. Your answer6. The half-life of a radioactive substance is 20 minutes. If we start with 980 g, find the mass after: a) 1 hour b) 10 minutes c) 1 minute
- 5. A sample of protactinium -234 of mass 100 g has a half-life of G-7 hours. A. what praction of the sample has not decayed after 20-1 hours? B. What is the mass of undecayed protactinium -234 after this period of time...15. An important tool in archeological research is radiocarbon dating, developed by the American chemist Willard F. Libby. This is a means of determining the age of certain wood and plant remains, hence of animal or human bones or artifacts found buried at the same levels. Radiocarbon dating is based on the fact that some wood or plant remains contain residual amounts of carbon-14, a radioactive isotope of carbon. This isotope is accumulated during the lifetime of the plant and begins to decay at its death. Since the half-life of carbon-14 is long (approximately 5,730 years¹), measurable amounts of carbon-14 remain after many thousands of years. If even a tiny fraction of the original amount of carbon-14 is still present, then by appropriate laboratory measurements the proportion of the original amount of carbon-14 that remains can be accurately determined. In other words, if Q(t) is the amount of carbon-14 at time t and Qo is the original amount, then the ratio Q(t)/Qo can be…1. Determine the element created, and its atomic number and mass number when Lead-204 undergoes alpha decay, producing a stable isotope. Write the nuclear reaction equation for this alpha decay. lead 204 => 204 82 Pb
- Bq. Determine the half-life (in s) of a radioactive sample that contains 1.50 x 1015 atoms and has an activity of 6.60 x 1013. A 100kg sample of Neptunium 234 (Np234) was accidentally released due to the gross negligence of Jerf, the worst nuclear engineer ever. A. Jerf plans to act as though nothing happened until 95% of the sample has decayed into other elements. How long will they have to keep waffling about pretending to do experiments? (hint: Wikipedia knows the half-life of (Np234)) B. After two weeks, Jarrison, Jerf's supervisor, notices Jerf has had a minor decrease in productivity and decides to confront Jerf. Realizing their jig is up, Jerf decides to eat as much as they can before Jarrison notices. Assuming they eat 5 kgs of Np 234, how much is left for Jarrison to find? C. Following this incident, Jarrison, along with the EPA, makes a graph detailing the amount of Np 234 in Jerf's lab. Draw this graph and label all important events. Do not include the amount of Np234 that Jerf ingested, as a serendipitous genetic immunity to radiation Jerf inherited is the only reason they did not succumb to…1. A patient is given 0.050 mg of Technetium-99m, a radioactive isotope with a half-life of about 6.0 hours. How long until the radioactive isotope decays to 6.3 x 10-3 mg?