The discussion clarifies the concept of 'black radiation' and its relationship with thermal radiation, particularly in the context of blackbody radiation. A blackbody, such as the sun, emits radiation based solely on its temperature, achieving equilibrium with its surroundings, as illustrated by a planet absorbing and emitting radiation from a star. The conversation references Leonard Susskind's work on black holes and Hawking radiation, emphasizing that any opaque enclosure at a constant temperature behaves like a blackbody, facilitating the absorption and emission of radiation. Key points include the behavior of materials in thermal equilibrium and the impact of reflectivity on heating rates.
PREREQUISITESPhysicists, engineers, and students interested in thermal radiation, blackbody concepts, and their applications in various scientific fields.
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