| 释义 |
Definition of black body in English: black bodynoun Physics A hypothetical perfect absorber and radiator of energy, with no reflecting power. Example sentencesExamples - In 1908 Einstein became a lecturer at the University of Bern after submitting his habilitation thesis which followed from the energy distribution law of black bodies.
- A black body is one that perfectly absorbs all the radiation falling on it and then re-emits all of that radiation.
- Consequently, a photonic crystal measured to have the same temperature, and therefore comparable energy, as a black body has to shed more energy as photons at allowed wavelengths.
- It is common in remote sensing applications to refer to the ‘brightness temperature’ of an object, defined as the temperature the body would need to have if it were a black-body emitting the same amount of radiation.
- The Sun radiates approximately as a black body with a temperature of 5800 K, which peaks in the optical region at a wavelength of about 0.6 m.
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