A LevelPhysicsEdexcelExam Questions9. ThermodynamicsThermal Energy Transfer

Thermal Energy Transfer (Edexcel A Level Physics): Exam Questions

Exam code: 9PH0

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Thermal Energy Transfer

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A sample of wax is heated at a constant rate of 800 W. The graph shows how the temperature of the wax changes with time.

Temperature-time heating curve with time in seconds on the horizontal axis, ranging from 0 to 600, and temperature in degrees on the vertical axis, ranging from 0 to 80. The graph shows three distinct regions: (1) a rising section from (0, 20) to (100, 50), (2) a flat horizontal section from (100, 50) to (400, 50), and (3) a rising section from (400, 50) onwards.

A data book contains the following information for wax:

  • latent heat of fusion of wax = 2.2×105 J kg−1

  • latent heat of vaporisation of wax = 1.6×106 J kg−1

Which of the following shows how to calculate the mass of wax that melts?

  • 800×3001.6×106

  • 800×6001.6×106

  • 800×3002.2×105

  • 800×6002.2×105

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