O-LevelPhysicsThermal Physics5054/12 · May/June 2020 · Q231 Mark
Four metal containers, with identical dimensions, are filled with water at 90 °C. All the faces, except one, of each container are covered in a very good insulator. The one exposed face on each container is painted either black or white. In which container does the water cool the fastest?
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Alarge face painted black
Blarge face painted white
Csmall face painted black
Dsmall face painted white
✓ Correct answer
A: large face painted black
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