The recoverable U. S. reserves of high-grade uranium-238 ore (high-grade ore contains about 10 kg of 238U3O8 per ton) are estimated to be about 500,000 tons. Neglecting any geological changes, what mass of 238U existed in this high-grade ore when the Earth was formed, about 4.8 billion years ago?
Answer to relevant QuestionsNitrogen-13, with a half-life of 10.0 min, decays by beta emission. (a) Write down the decay equation to determine the daughter product and whether the beta particle is a positron or electron. (b) If a sample of pure 13N ...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? On average, determine whether the nucleons are more tightly bound in a 27Al nucleus or in a 23Na nucleus. A cancer treatment called the gamma knife (see Insight 29.1, Biological and Medical Application of Radiation) uses focused 60Co sources to treat tumors. Each 60Co nucleus emits two gamma rays, of energy 1.33 MeV and 1.17 ...Determine which of the following isotopes are likely to be stable and explain clearly and fully how you came to your conclusion, based on the “ rules of stability”: (a) 15O, (b) 8Li, (c) 222Rn, (d) 27Mg, (e) 41Ca. ...
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