Question

Four metal cans are identical except for the color and texture of their outer surfaces. 3 litres of water at 70∘C is poured into each can. Which can cool the water most rapidly? State the reason.

Answer 1

Answer:

Black surfaces are the best emitters and abosrbers of heat radiation and shiny surfaces are the poor abosrbers of heat radiation.

Therefore, The can that is black and has rough surface will radiate heat faster and hence, the water in can P will cool down most rapidly