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Per17_exercise - b to slow down neutrons to energies...

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Period 17 Exercise Answers E.1 The appeal of using nuclear energy to generate electricity comes mainly from the fact that a) typical binding energies in nuclei are about a million times greater than the binding energies between atoms and molecules. b) the fissionable isotope U-238 is common in most rocks. c) operating reactors do not have any harmful byproducts. d) reactors make radioactive nuclei for use in the treatment of cancer. e) the storage of radioactive waste is no longer a problem. E.1 = a
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E.2 The function of the moderator in a nuclear reactor is to a) absorb slow neutrons to control the reaction. b) reduce the speed of neutrons to allow a chain reaction to occur. c) combine with the core in case of meltdown. d) carry heat away from the core. e) absorb radiation to protect the workers from radiation damage. E.2 = b E.3 The purpose of the control rods in a nuclear reactor is a) to serve as a catalyst that controls the
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Unformatted text preview: b) to slow down neutrons to energies appropriate for inducing fission in U-235. c) to supply the activation energy to start the reactor. d) to absorb neutrons and control the rate at which the fission reaction occurs. e) to cool the uranium as it fissions. E.3 = d E.4 Which of the following is not a component of a breeder nuclear reactor? a) fuel rods b) moderator c) control rods d) coolant e) containment system E.4 = b E.5 How much energy is stored in 0.5 kg of antiprotons and 0.5 kg of protons? a) 1.0 J b) 1.5 x 10 8 J c) 3.0 x 10 8 J d) 2.5 x 10 15 J e) 9.0 x 10 16 J All particles have antiparticles. When a particle and its antiparticle meet, they annihilate each other. All of their matter is converted into energy. E = M c 2 = (0.5 kg + 0.5 kg) x (3 x 10 8 m/s) 2 E = 1 kg x (9 x 10 16 m 2 /s 2 ) = 9 x 10 16 J E.5 = e Period 17 Answers E.1 = a E.2 = b E.3 = d E.4 = b E.5 = e...
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