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Home Q & A Board Science-Related Homework Help Physics
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Juicy93 Juicy93
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6 years ago
Which of the following statements about nuclear fission is most correct?
  a. Fission fragments almost always have about the same mass.
  b. Fission can only be produced when a neutron interacts with a heavy nucleus.
  c. The coulomb force is primarily responsible for fission.
  d. Almost all fission products are stable.


[Ques. 2] Which of the following statements about nuclear reactions is most true?
 
a. For high energies, the reaction is likely to be a compound nucleus reaction.
  b. At low energies, the reaction is likely to be a direct reaction.
  c. Nuclear reactions around a few hundred MeV are generally referred to as medium-energy nuclear reactions.
  d. Pions begin emerging from nuclear reactions at a little over 48 MeV.



[Ques. 3] Which of the following statements is most true?
 
a. Differential cross sections have values that are the same at all scattering angles .
  b. Total cross sections indicate the total probability of a scattering reaction.
  c. Exoergic reactions indicate that kinetic energy is converted into mass.
  d.Endoergic reactions indicate that energy is released in a nuclear reaction.



[Ques. 4] Which of the following technological advances was not useful in the 1930s to advance the study of nuclear reactions?
 

  a. Van de Graaff accelerator.
 

b. Two-mile long SLAC accelerator.
  c. Cockcroft-Walton high-voltage multiplier circuit.
  d. Cyclotron.


 



[Ques. 5] Which of the following statements describes the most specific function that a moderator serves in a nuclear fission reactor with uranium fuel cells?
 
a. slows down neutrons so that they are not absorbed to produce gamma rays
  b. prevents inelastic scattering of the neutrons so that they retain maximum energy
  c. prevent the chain reaction from becoming supercritical
  d. prevents too many neutrons from escaping from the fuel zone
  e. increases the time from formation of daughter nuclides to the emission of delayed neutrons



[Ques. 6] Neutron activation may include all of the following EXCEPT:
 
a. emission of a gamma ray
  b.compound nucleus
  c.a cross section dependence on 1/v, where v is the velocity of the neutron
  d. the neutron elastically scattering with a nucleus
  e.a transition of the nucleus to an excited state



[Ques. 7] In the nuclear reaction of 12C( , n)15O, the probability of observing a neutron is much higher than observing the byproducts of a similar reaction such as 12C( , p)15N. Which of the following provides a possible explanation of this occurrence?
 
a. There is always a higher probability for the compound nucleus to decay into products of lower mass.
  b. There is always a higher probability for the compound nucleus to decay into stable products.
  c. The compound nucleus 16O favors a decay to the n channel as opposed to the p channel for various reasons.
  d. The compound nucleus of 16O must make a forbidden transition to break into a proton and 15N.
  e. The entrance channel must enter into a compound nucleus to produce the 12C( , n)15O reaction as opposed to the direct reaction to produce the 12C( , p)15N reaction.



[Ques. 8] Suppose in a dying star, a reaction takes place under extreme pressure and temperature. This reaction is hypothetically as follows:
 

 

a. Endoergic
  b. Exoergic


 

c. Elastic
  d. Break-even
  e. Fission


 



[Ques. 9] Which of the following statements is true about fission reactions?
 
a. The fission products themselves are often unstable.
  b. Spontaneous fission occurs when low energy neutrons collide with an unstable nucleus.
  c. The nuclear strong force is most fundamentally responsible for forcing apart the nucleus during fission.
  d. Fission reactions are just as efficient at producing energy as fusion reactions.
  e. Binding energy per nucleon is greater for nuclei with Z >200 than for smaller nuclei, so heavier elements are less efficient in producing energy through fission reactions.



[Ques. 10] Which of the following statements best describes the line of stability?
 
a. It has N = Z when A = 240.
  b. It has Z > N at A = 240
  c. N always tends to be greater than Z.
  d. N tends to be greater than Z, especially for masses greater than calcium.
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Lewibr02Lewibr02
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Juicy93 Author
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6 years ago
tremendous help
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