black body

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black body

A scientist explains the concept of a black body using a diagram of a perfect absorber.

Definition
  1. Noun:
    • A theoretical, perfect absorber and emitter of radiation: A "black body" is a hypothetical, idealized physical object that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. Because it absorbs all radiation, it is also a perfect emitter of thermal radiation. The spectrum and intensity of the radiation it emits depend solely on its temperature.
Examples of Usage
  • Noun:
    • In physics, a black body is used as a standard model to understand thermal radiation.
    • The concept of a black body was crucial in the development of quantum mechanics.
    • No real object is a perfect black body, but a closed oven with a small hole is a very close approximation.
Advanced Usage
  • "Black-body radiation": The characteristic electromagnetic radiation emitted by a black body in thermal equilibrium.
    • The study of black-body radiation led Max Planck to propose the idea of quantized energy.
  • "Black-body spectrum": The specific distribution of wavelengths or frequencies of the radiation emitted by a black body at a given temperature.
    • The Sun's emission spectrum closely resembles a black-body spectrum at approximately 5,800 Kelvin.
Variants and Related Words
  • Blackbody (adj/noun): A common alternative spelling, often used as a compound adjective (e.g., blackbody radiation, blackbody curve).
  • Cavity radiator (noun): A practical device, like a hollow object with a small hole, that approximates the behavior of a black body.
  • Perfect emitter (noun): A descriptive term for one of the key properties of a black body.
  • Planckian locus (noun): The path or curve that the color of a black body traces in a color space as its temperature changes.
Synonyms
  • Ideal radiator: Emphasizes its perfect emission properties.
  • Full radiator: A term used in the reference definition, indicating it radiates energy at the maximum possible rate for its temperature.
Related Concepts (Not Phrasal Verbs or Idioms)
  • Stefan-Boltzmann law: States that the total energy radiated per unit surface area of a black body is proportional to the fourth power of its absolute temperature.
  • Wien's displacement law: Describes how the peak wavelength of black-body radiation shifts with temperature.
  • Ultraviolet catastrophe: A historical problem in classical physics predicting infinite ultraviolet radiation from a black body, which was resolved by quantum theory.
black body

A scientist explains the concept of a black body using a diagram of a perfect absorber.

Noun
  1. a hypothetical object capable of absorbing all the electromagnetic radiation falling on it
    • a black body maintained at a constant temperature is a full radiator at that temperature because the radiation reaching and leaving it must be in equilibrium

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