Suppose that some ancient writings on parchment are found sealed in a jar in a cave. If carbon-14 dating shows the parchment to be 28 650 years old, what percentage of the original carbon-14 atoms still remains in the sample?
Answer to relevant Questions(a) What is the decay constant of fluorine-17 if its half-life is known to be 66.0 s? (b) How long will it take for the activity of a sample of 17F to decrease to of its initial value? (c) Repeat part (b), but instead ...An ancient artifact is found to contain 250 g of carbon and has an activity of 475 decays/min. (a) What is the approximate age of the artifact, to the nearest thousand years? (b) What would its initial activity have been? 35Cl and 37Cl are two isotopes of chlorine. What are the numbers of protons, neutrons, and electrons in each if (a) The atom is electrically neutral, (b) The ion has a –2 charge, and (c) The ion has a +1 charge? The atomic mass of 23692U is 235.043 925 u. Find the average binding energy per nucleon for this isotope. A sample of 215Bi, which beta decays (t1/2 = 2.4 min), initially contains one-hundreth of Avogadro’s number of nuclei. (a) What is the sample’s mass? (b) Write down the beta decay equation and predict the product ...
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