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6 Radioactivity

6 Radioactivity

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Question 138

The moderator in a nuclear reactor slows down neutrons so that they are more likely to cause further fission reactions.

In a pressurized water reactor:

  • the average speed of the fast neutrons when first released is 2.4 × 107 m/s
  • the average speed of the moderated (slow) neutrons is 3.0 × 103 m/s

Calculate the average speed of the moderated neutrons as a percentage of the average speed of the fast neutrons.

Give your answer to 2 significant figures.

[2]
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6 Radioactivity Questions

  1. GCSE
  2. /Physics
  3. /6 Radioactivity

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