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2.3 Transfer of thermal energy

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Question 168

A hot, matte-black object emits thermal radiation. It is desired to reduce the rate at which radiation is emitted from its surface.

Three suggestions are made:

  1. Polish the surface of the object to make it shiny.
  2. Raise the temperature of the object.
  3. Decrease the surface area of the object.

Which of these suggestions would achieve the desired result?

A

1 only

B

1 and 2 only

C

1 and 3 only

D

1, 2 and 3

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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