Chapter 18 (I)

Chapter 18 (I) - Chapter 18 Bose-Einstein Gases (Part I)...

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Chapter 18 Bose-Einstein Gases (Part I) 18.1 Black-Body Radiation—a perfect quantal gas 18.1.1 Introduction irst one may ask: What is black ody radiation? A First, one may ask: What is black-body radiation? A perfectly black body radiation absorbs all radiation falling on it. This is very similar to the case that radiation enters a small hole in the wall of an opaque enclosure: after many reflections nearly all radiation is absorbed by e inner surface of the enclosure. the inner surface of the enclosure.
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All bodies emit electromagetic (EM) radiation by virtue of their temperature but usually this radiation is not in thermal equilibrium. If we consider the radiation within an opague nclosure whose wall is kept at a uniform temperature T enclosure whose wall is kept at a uniform temperature T, then radiation and walls reach a thermal equilibrium state, in which the radiation has quite definite properties. To study this equilibrium-state radiation, one cuts a small hole in the wall of the enclosure. Such a hole, if sufficiently small, will not disturb the equilibrium in the cavity and the emitted radiation will have the same properties as the cavity
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Chapter 18 (I) - Chapter 18 Bose-Einstein Gases (Part I)...

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