International A LevelPhysicsEdexcelExam Questions5. Thermodynamics, Radiation, Oscillations & CosmologyThermal Energy Transfer

Thermal Energy Transfer (Edexcel International A Level Physics)

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Thermal Energy Transfer

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Thermal Energy Transfer

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In an experiment to determine the specific latent heat of vaporisation of water LV , a student used an electrical heater to boil water in a beaker.

The experimental data gave LV = 2.20 MJ kg–1. The textbook value of LV is 2.26 MJ kg–1.

Which of the following could be an explanation for this difference in the values of LV?

  • Some energy is transferred to the surroundings.

  • The heater power was underestimated.

  • The student did not stir the water.

  • The heater is inefficient.

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