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6.5 Uses and dangers of radioactivity

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Question 53

Nuclei of lithium-7 can absorb high-energy protons and emit neutrons, but they do not undergo fission when they absorb neutrons.

In contrast, uranium-235 nuclei undergo fission when they absorb neutrons, emitting several more neutrons in the process.

Give a reason why a self-sustaining chain reaction can occur in a sample of uranium-235 but not in a sample of lithium-7.

[1]

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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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57

Question 53

Nuclei of lithium-7 can absorb high-energy protons and emit neutrons, but they do not undergo fission when they absorb neutrons.

In contrast, uranium-235 nuclei undergo fission when they absorb neutrons, emitting several more neutrons in the process.

Give a reason why a self-sustaining chain reaction can occur in a sample of uranium-235 but not in a sample of lithium-7.

[1]

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.