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6.5 Uses and dangers of radioactivity

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Question 39

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]

Markscheme

6.5 Uses and dangers of radioactivity Questions

GCSE
Physics
6.5 Uses and dangers of radioactivity

94 exam-style questions on Edexcel GCSE Physics 6.5 Uses and dangers of radioactivity. Each one has a worked solution and a mark scheme showing where the marks go.

6.5 Uses and dangers of radioactivity

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6.5 Uses and dangers of radioactivity

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Question 39

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]

Markscheme

6.5 Uses and dangers of radioactivity Questions

GCSE
Physics
6.5 Uses and dangers of radioactivity

94 exam-style questions on Edexcel GCSE Physics 6.5 Uses and dangers of radioactivity. Each one has a worked solution and a mark scheme showing where the marks go.