thermal radiation

thermal radiation - Eric Spector ASTR 2010 Modern Cosmology...

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Eric Spector ASTR 2010 – Modern Cosmology 2/6/08 Writing Assignment #2 – Thermal Radiation Thermal Radiation, otherwise known as “blackbody radiation,” is most easily described as the temperature dependence of a photons interaction with atoms and molecules of an object. Photons, or packets of light, come in contact with objects locally in nature. Objects with such molecular complexity, such as a rock or planet, do not allow light to pass through or be emitted from them. The energy in the photons bounce around inside, interacting and exchanging energy with the object’s atoms and molecules. The temperature, or average kinetic energy of the atoms, is matched by the photon energies. This photon dependence on temperature is the essence of thermal radiation. Thermal radiation is commonly seen in nature when wood is burnt in a fire. Before fire is applied, the wood only emits infrared light. Infrared is not visible to the human eye. We only perceive the light not absorbed, or reflected, by the molecular compounds of the wood. As heat is applied, the
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This note was uploaded on 03/31/2008 for the course ASTR 2010 taught by Professor Shull during the Spring '08 term at Colorado.

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thermal radiation - Eric Spector ASTR 2010 Modern Cosmology...

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