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2.3 Transfer of thermal energy

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Question 1

A wall-mounted hot-water radiator is used to heat a study room.

a.

Explain how thermal energy from the radiator warms the air in the room by convection. Use your ideas about the density of air.

[3]
b.

Some radiators are designed with a dull, black finish. Explain how a dull, black surface helps to transfer more thermal energy to the room.

[2]
c.

A sheet of shiny foil is attached to the wall directly behind the radiator. Explain how the shiny foil helps to keep the room warm.

[2]
Markscheme

2.3 Transfer of thermal energy Questions

  1. IGCSE
  2. /Physics
  3. /2.3 Transfer of thermal energy

301 exam-style questions on CIE IGCSE Physics 2.3 Transfer of thermal energy, covering 2.3.1a Thermal conductors and thermal insulators, 2.3.1b Explaining thermal conduction, 2.3.2 Convection, 2.3.3a Thermal radiation, 2.3.3b Surface colour and texture, 2.3.3c Rate of emission and absorption of radiation, and 2.3.4 Consequences of thermal energy transfer. Each one has a worked solution and a mark scheme showing where the marks go.

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