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6.5 Uses and dangers of radioactivity

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Question 16

In a high-temperature gas-cooled nuclear reactor (HTGR) using helium coolant and graphite blocks as a moderator:

the average speed of the fast fission neutrons upon release is 1.8 × 10⁷ m s^-1
the average speed of the moderated thermal neutrons is 3.1 × 10³ m s^-1

Calculate the average speed of the moderated thermal neutrons as a percentage of the average speed of the fast fission 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 16

In a high-temperature gas-cooled nuclear reactor (HTGR) using helium coolant and graphite blocks as a moderator:

the average speed of the fast fission neutrons upon release is 1.8 × 10⁷ m s^-1
the average speed of the moderated thermal neutrons is 3.1 × 10³ m s^-1

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