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Abstract
The Planck radiation law is derived in detail in several references. The discussion presented here aims to convey key insights, rather than rigorous mathematical terminology. Physical matter (atoms and molecules) at nonzero absolute temperature (T= 0 K) emits and absorbs electromagnetic radiation. Under thermodynamic equilibrium, the incident electromagnetic field and the atoms are in continual energy exchange, mutually sustaining each other's energy state by photon emission and absorption. If either the electromagnetic field intensity or the object's temperature should change, the energy exchange will adjust until thermodynamic equilibrium is re-established. The Planck radiation law is derived in detail in several references. The discussion presented here aims to convey key insights, rather than rigorous mathematical terminology. Physical matter (atoms and molecules) at nonzero absolute temperature (T= 0 K) emits and absorbs electromagnetic radiation. Under thermodynamic equilibrium, the incident electromagnetic field and the atoms are in continual energy exchange, mutually sustaining each other's energy state by photon emission and absorption. If either the electromagnetic field intensity or the object's temperature should change, the energy exchange will adjust until thermodynamic equilibrium is re-established.
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CHAPTER 3
41 PAGES


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