O-LevelPhysicsThermal Physics5054/12 · May/June 2017 · Q251 Mark

A metal box has four different surfaces; dull black, shiny black, dull silver and shiny silver. The box is filled with boiling water so that each surface is at the same temperature. A sensor measures the amount of radiation from each surface. Which surface emits the least radiation and which surface emits the most radiation?

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Adull black, shiny silver

Bdull silver, shiny black

Cshiny black, dull silver

Dshiny silver, dull black

✓ Correct answer

D: shiny silver, dull black

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Topic: Thermal Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2017 Paper 1 Variant 2, question 25.

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