A rock contains 0.688 mg of 206Pb for every 1.000 mg of 238U present. Assuming that no lead was originally present, that all the 206Pb formed over the years has remained in the rock, and that the number of nuclides in intermediate stages of decay between 238U and 206Pb is negligible, calculate the age of the rock.
Answer to relevant QuestionsThe mass ratios of 40Ar to 40K can also be used to date geological materials. Potassium-40 decays by two processes: a. Why are 40Ar/40K ratios rather than 40Ca/40K ratios used to date materials? b. What assumptions must be ...Calculate the binding energy in J/nucleon for carbon-12 (atomic mass 12.00000) and uranium-235 (atomic mass 235.0439). The atomic mass of 11H is 1.00782 amu, and the mass of a neutron is 1.00866 amu. The most stable nucleus ...Define fission and fusion. Fusion processes are more likely to occur for lighter elements, whereas fission processes are more likely to occur for heavier elements. Explain. Although y rays are far more penetrating than a particles, the latter are more likely to cause damage to an organism. Why? Which type of radiation is more effective at promoting the ionization of biomolecules? In addition to the process described in the text, a second process called the carbon-nitrogen cycle occurs in the sun: a. What is the catalyst in the above scheme? b. What nucleons are intermediates? c. How much energy is ...
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