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6.2 Uses and hazards

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Question 11
H

Each fission of a uranium-235 nucleus in a nuclear reactor releases 3.2 × 10-11 J of energy. A nuclear power station has a useful electrical power output of 1.2 GW1.2\ \text{GW}1.2 GW. The efficiency of the power station is 40%.

a.

Calculate the number of uranium-235 nuclei that undergo fission each second. Give your answer to 2 significant figures.

[4]
b.

The mass of one uranium-235 nucleus is 3.9 × 10-25 kg. Calculate the mass of uranium-235 used up in one day.

[3]
Markscheme

6.2 Uses and hazards Questions

  1. GCSE
  2. /Physics
  3. /6.2 Uses and hazards

48 exam-style questions on OCR GCSE Physics 6.2 Uses and hazards, covering 6.2.1 Contamination and irradiation, 6.2.2 Half-life and radiation hazards, 6.2.3 Medical uses of nuclear radiation, 6.2.4 Nuclear fission and chain reactions, and 6.2.5 Nuclear fusion. Each one has a worked solution and a mark scheme showing where the marks go.

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