TB_chapter30 - Chapter 30, Nuclear Energy and Elementary...

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Chapter 30, Nuclear Energy and Elementary Particles C HAPTER 30 Conceptual Questions C1. When considering the law of conservation of lepton number for a reaction, how many different lepton numbers must be checked? a. 1 b. 2 c. 3 d. 6 C2. If the lifetime of a particle is roughly inversely proportional to the relative strength of the force involved, then for the strong, electromagnetic, and weak forces, arrange the forces according to their resulting lifetimes ranging from shortest to longest lifetimes. a. strong, electromagnetic, weak b. weak, electromagnetic, strong c. weak, strong, electromagnetic d. strong, weak, electromagnetic C3. The law of conservation of strangeness tells us that strangeness is not conserved for which of the following interactions? a. strong b. electromagnetic c. weak d. All three of the above interactions conserve strangeness. C4. Which, if any, is an elementary particle? a. the proton b. the - particle c. the muon d. All three are not elementary particles. C5. Baryons are composed of 3 quarks. If all 3-quark compositions of particles could happen, what would be the highest possible charge for such a particle? a. 1 e b. 2 e c. 3 e d. There is no upper limit, though the charge is usually less than 3 e. 252
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Chapter 30, Nuclear Energy and Elementary Particles 30.1 Nuclear Fission 1. Nuclear fission was first observed by: a. Hahn and Strassman. b. Meitner and Frisch. c. Einstein and Fermi. d. Dirac and Heisenberg. 2. The average mass per nucleon is greatest in which of the following elements? a. hydrogen b. iron c. uranium d. krypton 3. A capture by a target nucleus of uranium-235 is most apt to occur for which type of “bullet” particle? a. low velocity alpha particle b. low velocity proton c. high velocity neutron d. low velocity neutron 4. In order to be useful in sustaining a reaction, the neutrons in a fission reactor must be: a. released from the reactor. b. warmed to a higher temperature. c. accelerated. d. decelerated. 5. In a nuclear reactor which uses the fission process, which of the following is the most likely result in the event of a cooling system failure followed by a nuclear accident? a. proliferation of plutonium fuel b. accumulation of critical mass of fissionable material c. spread of radioactive material into the environment d. reduction of ozone in upper atmosphere 253
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Chapter 30, Nuclear Energy and Elementary Particles 6. Assume that (i) the energy released per fission event of 235 U is 208 MeV, and (ii) 30% of the nuclear energy released in a power plant is ultimately converted to usable electrical energy. Approximately how many fission events will occur in one second in order to provide the one GW electrical power output of a typical power plant? (1 eV = 1.6 × 10 - 19 J) a. 2 × 10 16 fission/s b. 1 × 10 20 fission/s c. 3 × 10 24 fission/s d. 2 × 10 27 fission/s 7. What characteristic is preferred in the elements contained in moderator materials when used in a nuclear fission reactor?
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This note was uploaded on 01/06/2012 for the course PHYS 201 taught by Professor Coffin during the Spring '09 term at Oregon State.

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TB_chapter30 - Chapter 30, Nuclear Energy and Elementary...

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