Physics 0625 · IGCSE · Transfer of thermal energy

Transfer of thermal energy — practice question

The outer surface of one of two identical shiny metal containers is coated with dull black paint. Both containers hold equal masses of hot water at the same temperature. Why does the dull black container cool faster?

  • ABlack surfaces are better conductors than shiny surfaces.
  • BBlack surfaces are better emitters of radiation than shiny surfaces.
  • CBlack surfaces are better reflectors of radiation than shiny surfaces.
  • DBlack surfaces are worse absorbers of radiation than shiny surfaces.

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