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6.5 Uses and dangers of radioactivity

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Question 11

In an astrophysical simulation of stellar nucleosynthesis, two helium-3 nuclei undergo fusion to produce a helium-4 nucleus and two protons.

2 helium-3→helium-4+2 protons 2\text{ helium-3} \rightarrow \text{helium-4} + 2\text{ protons} 2 helium-3→helium-4+2 protons
  • The total mass of the reactants before fusion is 9.982 × 10-27 kg.
  • The total mass of the products after fusion is 9.914 × 10-27 kg.

This difference in mass is converted into energy.

Calculate the percentage of the original mass that has been converted to energy. Give your answer to 2 significant figures.

[3]
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6.5 Uses and dangers of radioactivity Questions

  1. GCSE
  2. /Physics
  3. /6.5 Uses and dangers of radioactivity

94 exam-style questions on Edexcel GCSE Physics 6.5 Uses and dangers of radioactivity, covering 6.5.1 Uses of radioactivity, 6.5.2 Dangers of ionising radiation and precautions, 6.5.3 Half-life and radiation dangers, 6.5.4 Safety precautions for radiation exposure, and 6.5.5 Contamination and irradiation. Each one has a worked solution and a mark scheme showing where the marks go.

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