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- 12. The half-life of Calcium-47 is 3.91 x 105 seconds. A sample contains 4.11 x 1016 nuclei. How much of the sample is left after 7.82 x 105 seconds? 2.57 x 1015 nuclei 5.14 x 1015 nuclei 2.06 x 1016 nuclei 1.03 x 1016 nuclei15. 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
- 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?15. A nuclide (Z,A may transform into a nuclide (Z-1,A) by the emission of a. an alpha b. a В- a B+ d. gamma emission C.The half-life of a radioactive isotope is 6.02 hours. 25.0 Grams of this isotope is needed for an experiment. How many grams of the isotope must be ordered if 48 hours pass between the time the isotope is ordered and the start of the experiment?