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Learn about the thermal electromagnetic radiation emitted by a black body, an idealized opaque, non-reflective body in thermodynamic equilibrium. Find out the theory, spectrum, applications, history and references of black-body radiation.
Electromagnetic waves emitted by a blackbody are called blackbody radiation. Figure \(\PageIndex{2}\): The intensity of blackbody radiation versus the wavelength of the emitted radiation. Each curve corresponds to a different blackbody temperature, starting with a low temperature (the lowest curve) to a high temperature (the highest curve).
14 wrz 2024 · Blackbody radiation, energy radiated by any object or system that absorbs all incident radiation. The term usually refers to the spectrum of light emitted by any heated object; common examples include the heating element of a toaster and the filament of a light bulb.
What is meant by the phrase “black body” radiation? The point is that the radiation from a heated body depends to some extent on the body being heated. To see this most easily, let’s back up momentarily and consider how different materials absorb radiation. Some, like glass, seem to absorb light hardly at all—the light goes right through.
An ideal blackbody absorbs all incident electromagnetic radiation, all of which is subsequently re-radiated. At thermal equilibrium, the rate at which a blackbody absorbs energy is equal to the rate at which it radiates energy.
Learn about the history and theory of blackbody radiation, a concept that challenged classical physics and led to quantum mechanics. Explore the failures of classical physics, the laws of Wien and Stefan-Boltzmann, and Planck's quantum hypothesis.
12 mar 2024 · It is called blackbody radiation, because an ideal radiator is jet black. It absorbs all radiation incident on it, and thus it can be at thermal equilibrium with the surrounding while emitting more radiation than a white object, which reflects radiation.
