A hollow aluminium cube is packed with very hot water. Side X of the cube lies opposite side Y. Of these two sides, one is black and the other is white. A student places the back of one hand 5 cm from side X, then straight away places the back of the other hand 5 cm from side Y. The hand near side Y is felt to be warmer than the hand near side X. Which row shows which side is black and also compares the rate at which thermal radiation is emitted from each side correctly?
Physics 0625 · IGCSE · Transfer of thermal energy