CAS CH 109 Chapter Notes - Chapter 1: Uncertainty Principle, Ultraviolet, Work Function
22 Nov 2014
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Incandescence - phenomenon of objects glowing when at high. Color of light changes from red to orange and so on towards white as temperature changes. Black body radiation o o o o o. The radiation emitted at different wavelengths by a heated black. As temperature rises, the maximum intensity of the radiation body (hot object) for a series of temperatures emitted occurs at shorter and shorter wavelengths. Classical physics predicted that any hot body should emit intense ultraviolet radiation and even x-rays and gamma rays. Even a human body would glow in the dark. Planck proposed that exchange of matter that occurs between matter and o radiation occurs in quanta (packets) of energy. A charged particle oscillating at a frequency can exchange energy with its surrounding by generating or absorbing electromagnetic radiation only in discrete packets of energy. H = planck"s constant = 6. 626 x 10-34.
