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3.2 Internal energy and energy transfers

3.2 Internal energy and energy transfers

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Question 16

During a test of a superconducting quantum-computing cryostat, a constant thermal load causes liquid nitrogen at its boiling point to vaporise. The cryostat is mounted on a highly sensitive digital balance to monitor mass loss.

The following data were recorded during a 15-minute run:

  • Initial mass of the liquid nitrogen container system = 8.645 kg8.645\text{ kg}8.645 kg
  • Final mass of the liquid nitrogen container system = 8.215 kg8.215\text{ kg}8.215 kg
  • Total thermal energy transferred to the liquid nitrogen = 85.57 kJ85.57\text{ kJ}85.57 kJ

Calculate the experimental value for the specific latent heat of vaporisation of nitrogen from this data. State the correct SI unit with your answer.

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Markscheme

3.2 Internal energy and energy transfers Questions

  1. GCSE
  2. /Physics
  3. /3.2 Internal energy and energy transfers

37 exam-style questions on AQA GCSE Physics 3.2 Internal energy and energy transfers, covering 3.2.1 Internal energy, 3.2.2 Temperature changes in a system and specific heat capacity, and 3.2.3 Changes of state and specific latent heat. Each one has a worked solution and a mark scheme showing where the marks go.

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