一道有关热辐射的英语物理题目,请大神解答,最好带有物理量和单位A dish of hot food has an emissivity of 0.4 and emits 20W of thermal radiation, if you wrap it in aluminum foil ,which has an emissivity of 0.08, how much power will it radiate?
问题描述：
一道有关热辐射的英语物理题目,请大神解答,最好带有物理量和单位
A dish of hot food has an emissivity of 0.4 and emits 20W of thermal radiation, if you wrap it in aluminum foil ,which has an emissivity of 0.08, how much power will it radiate?
答
首先知道物体的辐射率等于物体在一定温度下辐射的能量与同一温度下黑体辐射能量之比.所以,知道此温度下黑体辐射率为20/0.4=50W.又知道铝片的辐射率0.08,所以,在这个温度下,铝片辐射功率为50*0.08=4W.虽然食物辐射出2...