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6.5 Uses and dangers of radioactivity

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Question 18

In an experimental nuclear fusion reactor, a deuterium nucleus and a tritium nucleus undergo fusion to produce a helium nucleus and a neutron.

deuterium+tritium→helium+neutron \text{deuterium} + \text{tritium} \rightarrow \text{helium} + \text{neutron} deuterium+tritium→helium+neutron
  • The total mass of the reactants (deuterium and tritium) before fusion is 8.35 × 10-27 kg.
  • The total mass of the products (helium and neutron) after fusion is 8.32 × 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]
Markscheme

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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