Which of the following technological advances was not useful in ...

[storky111]

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.

 

Question 2

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

Question 3

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

[joechoochoy]

Answer to Question 1

b.
the two-mile long SLAC accelerator was not established until 1962.

Answer to Question 2

²³⁵U and ²³⁸U exist in the fuel rods of a nuclear fission reactor, and high energy (that is, higher energy than thermal) neutrons are absorbed with a high cross section by the ²³⁸U. The moderator, in many cases the hydrogen in water, collides with the high energy neutrons so that they are not absorbed to create a ²³⁸U(n, ) reaction but instead fission the ²³⁵U.
a.

Answer to Question 3

d.
In neutron activation, the neutron is captured by the nucleus to form an excited state of a compound nucleus. The nucleus then decays by emitting a gamma ray.

[storky111]

Excellent

[covalentbond]

Great answer, keep it coming