put the appropriate word or phrase in each blank. do not use numbers. an object that absorbs all radiation that falls on it has an emissivity with a value of and is called a .

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14-10-2022
Physics

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put the appropriate word or phrase in each blank. do not use numbers. an object that absorbs all radiation that falls on it has an emissivity with a value of and is called a .

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kumarravichandra kumarravichandra · Answer 1 · 2022-10-17T14:42:03-04:00

An object that absorbs all radiation that falls on it has an emissivity with a value of 1 and is called a blackbody.

Thermal radiation is emitted by every item above absolute zero. The amount of thermal radiation emitted, however, is a function of the emissivity of the object's surface for any given wavelength and temperature.

Emissivity is defined as the ratio of energy emitted from a material's surface to that emitted from a blackbody, a perfect emitter with the same temperature, wavelength, and viewing conditions. Between 0 and 1, it is a dimensionless number.

In addition to the material, a surface's emissivity is also influenced by its composition. An oxidized and roughened metal surface, for instance, will have a greater emissivity compared to a clean and polished metal surface. Emissivity is defined as the ratio of radiation emitted from an item to that emitted from a blackbody when the temperatures and wavelengths are observed under identical conditions.

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