Therefore when a body is heated their molecules and atoms vibrate and consequently these vibrations cause charge oscillations, these oscillations on the other hand radiate giving out heat and light. These molecules and atoms are made up of complicated patterns of electrical charges. Heat is known to cause molecules and atoms to vibrate. Why do heated bodies radiate? How is this radiation absorbed? To answer the first question we have to understand the mechanisms involved. This, therefore, makes the furnace to be at some kind of equilibrium. The walls on the other hand are also very hot and therefore also emitting radiation which in turn can be absorbed by another part of the furnace or it could also escape through the opening at the door. If this happens, this outside heat is absorbed by the walls of the furnace on the inside. Heat energy can enter from the outside to the furnace if there happens to be an opening at the door.
The shorter the wavelength the higher the frequency and this high frequency causes high temperature.Ī good example of black body radiation is a furnace. In this spectrum of radiation emitted by the black body, there are both short and long wavelengths.
Therefore this thermal radiation that is emitted by a black body is what is called the black body radiation. Black body radiation is a term coined from the fact that a black body emits radiation that is dependent on temperature. During the emission of radiation by black bodies, no light is transmitted therefore the object will always appear black when cold.
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