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Julia Coggins
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Why is Planck radiation the greatest amount of radiation that anybody at thermal equilibrium can emit from its surface, whatever its chemical composition or surface structure?
So that's an inherent fact? Planck radiation depends on the temperature of the body, so for example at room temperature a body emits infared radiation and cannot be seen. Whereas at the surface of the sun, it emits visible light as well. I guess Planck radiation is inherently the limit, but referring to it when in fact in radiates another light by means of Plack confuses me.Simon Bridge said:The clue is in the definition... what would it mean if the body could emit more?
What would happen?
Planck radiation refers to the electromagnetic radiation emitted by a body due to its temperature. It was first described by physicist Max Planck in the early 20th century and is also known as blackbody radiation.
Planck's law states that at a given temperature, a blackbody (or idealized object) will emit the maximum amount of radiation possible for that temperature. This means that no other body can emit more radiation than a blackbody at the same temperature, making Planck radiation the maximum amount of radiation a body can emit.
According to Planck's law, the higher the temperature of the body, the higher the frequency and intensity of its emitted radiation. This means that as a body's temperature increases, it emits more radiation at shorter wavelengths, such as visible light, making it appear brighter.
Planck radiation is important in understanding the thermal radiation emitted by objects in the universe, such as stars and galaxies. By studying the radiation emitted by these objects, scientists can determine their temperature and composition, providing valuable insights into the formation and evolution of the universe.
Planck radiation is used in a variety of practical applications, such as thermal imaging cameras, infrared sensors, and even in cooking. By measuring the radiation emitted by an object, scientists and engineers can gather information about its temperature and properties, making it a valuable tool in many fields of study.