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Radioactivity (A-level only)

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Question 39

In a thermal nuclear reactor, both the moderator and the control rods play critical roles in managing the fission chain reaction.

Which row correctly identifies the intended effect of each component on the neutrons within the core?

A

Moderator: decreases average neutron kinetic energy; Control rods: decreases number of neutrons available for fission

B

Moderator: decreases average neutron kinetic energy; Control rods: no effect on the number of neutrons available for fission

C

Moderator: no effect on average neutron kinetic energy; Control rods: decreases number of neutrons available for fission

D

Moderator: no effect on average neutron kinetic energy; Control rods: no effect on the number of neutrons available for fission

Markscheme

Radioactivity (A-level only) Questions

  1. A Level
  2. /Physics
  3. /Radioactivity (A-level only)

128 exam-style questions on AQA A Level Physics Radioactivity (A-level only), covering Rutherford scattering (A-level only), $\alpha$ , $\beta$ and $\gamma$ radiation (A-level only), Radioactive decay (A-level only), Nuclear instability (A-level only), Nuclear radius (A-level only), Mass and energy (A-level only), Induced fission (A-level only), and Safety aspects (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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