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samreen
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what is 'black radiation' ? or specifically, the meaning of the phrase "radiation in equilibrium with matter"...in the context of thermal radiation. clueless here :'(
Correct, the inside of an oven is a pretty good black bodysamreen said:nope. i mean black radiation. I am talking general here. we know from kirchhoffs work that any enclosure that is opaque to all kinds of radiation, will when maintained at any constant temperature, behave like an ideal black body, and emit radiation characteristic of that temperature, right?
image a piece of black material (eg soot covered metal) placed inside an oven, infrared radiation from the oven will hit the material, be absorbed and heat it up.what i don't follow is when the texts say that any speck of matter placed inside such an enclosure will attain equilibrium with the radiation filling the enclosure and the blacker it is, the faster this will happen. when it has, this speck starts emitting black radiation
Thermal radiation is the process by which heat is transferred from one object to another through electromagnetic waves. It is also known as heat radiation or infrared radiation.
Thermal radiation does not require a medium, such as air or water, to transfer heat. It can occur in a vacuum and is not affected by the temperature difference between the objects involved.
Black radiation refers to the idealized form of thermal radiation that is emitted by an object that absorbs all incoming radiation and does not reflect or transmit any of it. This is also known as a blackbody radiator.
All objects emit thermal radiation, but the amount and wavelength of the radiation depend on the object's temperature and surface properties. Black radiation is used as a theoretical standard for understanding and measuring thermal radiation.
Thermal radiation plays a crucial role in everyday life, from heating our homes and cooking food to powering solar panels. It is also used in various industrial processes, such as drying and sterilization. Black radiation is used in fields like astronomy to study the thermal properties of celestial objects and in engineering to design efficient thermal systems.