Four identical metal cans are filled with equal volumes of hot water at 80 ∘C80\,^\circ\text{C}80∘C. Each can has a different outer surface finish:
Which can will cool down the most rapidly?
Can 1 (dull black)
Can 2 (dull white)
Can 3 (shiny black)
Can 4 (shiny silver)
99 exam-style questions on CIE IGCSE Physics 2.3.3a Thermal radiation. Each one has a worked solution and a mark scheme showing where the marks go.