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4 marksAtomic Mass

CAPE Physics Unit 2 · 2011 · Paper 2 · Question 6(b)(ii)

Fission of 1 kg of uranium-235 releases as much thermal energy as 50 000 kg of oil. 30 MJ of energy is released per kg of oil burned. A 1000 MW power station operates at 25% efficiency.

Calculate the mass of uranium used per day by the power station.

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Other parts of this question

  1. 6(a)(i)Explain what is meant by 'nuclear fission'.[1 mark]
  2. 6(a)(ii)Sketch a graph to show how the binding energy per nucleon varies with the mass number of the nucleus. Show on the graph the approximate positions of carbon-12…[3 marks]
  3. 6(a)(iii)Use your graph to explain why energy is released when a heavy nucleus undergoes fission.[2 marks]
  4. 6(b)(i)Calculate the mass of oil used per day by the power station.[4 marks]
  5. 6(c)Hence comment on the sustainability of using oil as an energy source for the next century.[1 mark]

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