2017 · M/J · 5054/12 | Q25

25 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. sensor dull meter shiny silver silver Which surface emits the least radiation and which surface emits the most radiation? least most A dull black shiny silver B dull silver shiny black C shiny black dull silver D shiny silver dull black