实验表明,任何物体在任何温度下都会向周围空间发射电磁波,物体在单位时间内辐射电磁波能量的多少以及能量按波长(或频率)的分布与物体的温度有关。由物体的温度所决定的电磁辐射现象,叫做热辐射。与热辐射有关的温室效应、环境气候等热点问题作为命题背景,在高考及竞赛试题中已多次出现,由于试题情景的新颖性、知识内容的综合性、分 Experiments show that any object emits electromagnetic waves to the surrounding space at any temperature, how much the object radiates electromagnetic energy per unit time, and the distribution of energy by wavelength (or frequency) is related to the temperature of the object. The phenomenon of electromagnetic radiation, which is determined by the temperature of an object, is called thermal radiation. Hot issues related to heat radiation, such as the greenhouse effect and the environment and climate, have come into the background of college entrance examination and competition examinations many times. Due to the novelty of the test scenario and the comprehensiveness of knowledge contents,