Physics · May / June 2024 · Paper 11 · Question 21
5054Radiation
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.
As printed in the paper
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Correct answer: D. Shiny metal foil is a poor emitter of infrared radiation.
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