Chapter 33 Early Quantum Theory and Models of the atom 8 33-1 Planck's Quantum Hypothesis(P763-764) 1. Black- body radiation(黑体辐射) One of the observations that was unexplained at the end of the 19th century was the spectrum of light emitted by hot objects. 1)热辐射实验证明不同温度下物体能发出不同的电 磁波,这种能量按频率的分布随温度而不同的电磁辐 射叫做热辐射. a we known that all objects emit radiation whose total intensity is proportional to the fourth power of the Kelvin temperature I∝TChapter 33 Early Quantum Theory and Models of the Atom §33-1 Planck’s Quantum Hypothesis (P763－764) 1. Black-body Radiation (黑体辐射) One of the observations that was unexplained at the end of the 19th century was the spectrum of light emitted by hot objects. 1) 热辐射 实验证明不同温度下物体能发出不同的电 磁波，这种能量按频率的分布随温度而不同的电磁辐 射叫做热辐射. A we known that all objects emit radiation whose total intensity is proportional to the fourth power of the Kelvin temperature. 4 I  T