On absorption of a single neutron, plutonium Pu-239 can undergo fission into xenon Xe-134 plus zirconium Zr-103 plus three neutrons. The masses of these nuclei are, mpu-239 = 239.052 amu, mxe-134 = 133.905 amu, and mzr-103 = 102.927 amu. Calculate the energy given off in this nuclear reaction. Back Alt+Left arrow
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Q: (Answer in MeV) Question in image
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- Determine the energy released in the fusion reaction H+H → He +n in MeV. m²H = 2.014102u, M³H = 3.016049u, mHe = 4.002603u, mn = 1.008665u, 1u = =931.5MeV/c² IThe uranium isotope 235U can fission—break into two smaller-masscomponents and free neutrons—if it is struck by a free neutron. A typical reaction is 1/0n + 235/92U → 141/56Ba + 92/36Kr + 3/1/0nAs you can see, the subscripts (the number of protons) and the superscripts (the number of nucleons) “balance” before and after the fission event; there is no change in the number of protons or neutrons. Significant energy is released in this reaction. If a fission event happens in a large chunk of 235U, the neutrons released may induce the fission of other 235U atoms, resulting in a chain reaction. This is how a nuclear reactor works. The number of neutrons required to create a stable nucleus increases with atomic number. When the heavy 235U nucleus fissions, the lighter reaction products are thus neutron rich and are likely unstable. Many of the short-lived radioactive nuclei used in medicine are produced in fission reactions in nuclear reactors.An unstable nucleus undergoes alpha decay with the release of 5.52 MeV of energy. The combined mass of the parent and daughter nuclei is 452 u. What was the parent nucleus? You can use Appendix D in Krane to identify the parent nucleus.
- A moon rock collected by a U.S. Apollo mission is estimated to be 3.90 billion years old by uranium/lead dating. Assuming that the rock did not contain any lead when it was formed, what is the current mass of 20°Pb in the rock, if it currently contains 1.340 g of 238 U? The half-life of 238U is 4.47 × 10° years. 206Pb mass: 1.1 IncorrectA 21186Rn nucleus undergoes alpha decay according to the reaction 21186Rn → 20784Po + 42He. Determine the following. (Let the atomic mass of 21186Rn be 210.9906 u, the atomic mass of 20784Po be 206.9816 u and the atomic mass of 42He be 4.0026 u.) (a)Q value (in MeV) for the process (Enter your answer to at least two decimal places.) (b)Kinetic energy (in MeV) of the alpha particle after the decay (Enter your answer to at least two decimal places.) (c) Kinetic energy (in MeV) of the daughter nucleus after the decayFor a fusion reaction, at which temperature T do you expect the optimal reaction rate to approximately occur? In the expressions below EG is the Gamow energy of the reaction and k is the Boltzmann constant. Select one: O a. T O b. T: O c. T d. T = Oe. T - - = = EG 100k 10EG k EG 10k EG k 100 EG k
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