Three identical metal spheres (of same surface area) have red, black and white colors and they are heated up…
Three identical metal spheres (of same surface area) have red, black and white colors and they are heated up to same temperature. They are allowed to cool. Arrange them from maximum rate of cooling to minimum rate of cooling
black, red, white
white, red, black,
red, black, white
red, white, black
Solution
The cooling rate of an object depends on its emissivity, with darker colors having higher emissivity. Therefore, the black sphere will cool the fastest, followed by the red sphere, and then the white sphere.