The (18 9 F) nucleus is unstable. Draw an energy-level diagram and predict how it will decay.
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The (18 9 F) nucleus is unstable. Draw an energy-level diagram and predict how it will decay.
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- Radioactive potassium-40 has a half-life of 4.2 x 1016 s. a) Calculate the decay constant of potassium-40. b) A sample of potassium-40 has an initial mass of 1.0 g. Calculate the number of parent nuclei present in the sample, as well as the initial activity of the source. (One mole of potassium-40 has a mass of 40 g and NA = 6.0 x 1023 mol-1) c) Calculate the number of parent nuclei present in the sample after 9.2 x 1016 s.QU5: Nitrogen-13 undergoes beta plus decay. Determine the daughter nucleus and compare the binding energy per nucleon before the decay to after the decay. Which value should be higher? Nucleus Nitrogen-13 Boron-9 Lithium-9 Nitrogen-12 Carbon-13 Oxygen-13 Fluorine-17 Sodium-17 v1 mass (u) 13.00573861 9.0133296 9.02679019 12.0186132 13.00335483534 13.024815 17.00209524 17.037270Consider two heavy nuclei X and Y having similar mass numbers. If X has the higher binding energy, which nucleus tends to be more unstable?
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