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Nuclear fission: Quiz

  
  
  
  














Question 1: The variation in specific binding energy with ________ is due to the interplay of the two fundamental forces acting on the component nucleons (protons and neutrons) that make up the nucleus.
Periodic tableChemical elementAtomic numberHafnium

Question 2: The fission reaction also releases ~7 MeV in prompt ________ photons.
Nuclear fissionX-rayGamma rayNuclear fusion

Question 3: This tendency for fission product nuclei to beta-decay is the fundamental cause of the problem of ________ high level waste from nuclear reactors.
Gamma rayNuclear fusionRadioactive decayNuclear fission

Question 4: The actual ________ of a critical mass of nuclear fuel depends strongly on the geometry and surrounding materials.
Classical mechanicsGeneral relativityMassForce

Question 5: Norris Glasoe, and ________.
Herbert L. AndersonFrancis G. SlackJohn R. DunningEugene T. Booth

Question 6: Such devices use radioactive decay or ________ to trigger fissions.
Nuclear fusionIonizing radiationX-rayParticle accelerator

Question 7: In the summer, Fermi and Szilard proposed the idea of a ________ (pile) to mediate this process.
Nuclear powerUraniumNuclear reactor technologyPlutonium

Question 8: What does the following picture show?

  A visual representation of an induced nuclear fission event where a slow-moving neutron is absorbed by the nucleus of a uranium-235 atom, which fissions into two fast-moving lighter elements (fission products) and additional neutrons. Most of the energy released is in the form of the kinetic velocities of the fission products and the neutrons. Also shown is the capture of a neutron by uranium-238 to become uranium-239.
  A schematic nuclear fission chain reaction. 1. A uranium-235 atom absorbs a neutron and fissions into two new atoms (fission fragments), releasing three new neutrons and some binding energy. 2. One of those neutrons is absorbed by an atom of uranium-238 and does not continue the reaction. Another neutron is simply lost and does not collide with anything, also not continuing the reaction. However one neutron does collide with an atom of uranium-235, which then fissions and releases two neutrons and some binding energy. 3. Both of those neutrons collide with uranium-235 atoms, each of which fissions and releases between one and three neutrons, which can then continue the reaction.
  A visual representation of an induced nuclear fission event where a slow-moving neutron is absorbed by the nucleus of a uranium-235 atom, which fissions into two fast-moving lighter elements (fission products) and additional neutrons. Most of the energy released is in the form of the kinetic velocities of the fission products and the neutrons. Also shown is the capture of a neutron by uranium-238 to become uranium-239.
  An induced fission reaction. A slow-moving neutron is absorbed by the nucleus of a uranium-235 atom, which in turn splits into fast-moving lighter elements (fission products) and releases three free neutrons.

Question 9: New Zealander, ________ is credited with splitting the atom in 1917.
Marie CurieJohn Strutt, 3rd Baron RayleighJ. J. ThomsonErnest Rutherford

Question 10: Elemental isotopes that undergo induced fission when struck by a free ________ are called fissionable; isotopes that undergo fission when struck by a thermal, slow moving neutron are also called fissile.
NeutronElectronProtonAtom
















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