Political Science 1020E Lecture Notes - Lecture 28: Photon, Cathode Ray Tube, The Breakthrough
2 Oct 2016
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Document Summary
As we saw in the previous lesson, rutherford"s model of the atom had some serious difficulties. The revolution of quantum theory required almost three decades to unfold, and many scientists contributed to its development. It began in 1900 with planck"s quantum hypothesis and culminated in the mid-1920s with the theory of quantum mechanics of schr dinger and heisenberg which has been so effective in describing the structure of matter. Refer to pearson pages 702 to 710 for a discussion about the quantum nature of matter and light. One of the observations that was unexplained at the end of the nineteenth century was the spectrum of light emitted by hot objects. At normal temperatures (300 k), we are not aware of this electromagnetic radiation because of its low intensity and long wavelength. At higher temperatures (~500 600 k), there is sufficient infrared radiation that we can feel heat if we are close to the object.
