Internal energy and energy transfers

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Question 20
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An astrophysicist is testing a cooling system for an infrared space telescope sensor using liquid nitrogen. To calibrate the system, they determine the specific latent heat of vaporisation of the nitrogen. The following measurements are recorded during a controlled boiling phase:

  • Initial mass of the cryogenic vessel and liquid nitrogen = 0.674 kg0.674\text{ kg}0.674 kg
  • Final mass of the cryogenic vessel and liquid nitrogen = 0.584 kg0.584\text{ kg}0.584 kg
  • Electrical energy supplied to the vessel's heater while the nitrogen boiled = 17 910 J17\,910\text{ J}17910 J

Calculate the specific latent heat of vaporisation of liquid nitrogen from these data. State the correct unit with your answer.

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Internal energy and energy transfers Questions

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