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O-LevelPhysicsThermal Physics5054/11 · May/June 2024 · Q211 Mark

A hot meal is supplied in a container made of shiny metal foil. Why does the container help to keep the food hot?

AThe container traps air which increases convection.
BThe foil is a poor thermal conductor.
CShiny metal foil is a good absorber of infrared radiation.
DShiny metal foil is a poor emitter of infrared radiation.

✓ Correct answer

D: Shiny metal foil is a poor emitter of infrared radiation.

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About this question

Topic
Thermal Physics, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source
O-Level Physics, May/June 2024 Paper 1 Variant 1, question 21.

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