Kirchhoff's perfect black bodies absorb all the radiation that falls on them, right in an infinitely thin surface layer, with no reflection and no scattering.
12.
This type of theoretical model, with frequency-independent emissivity lower than that of a perfect black body, is often known as a " grey body ".
13.
Kirchhoff in 1860 introduced the theoretical concept of a perfect black body with a completely absorbing surface layer of infinitely small thickness, but Planck noted some severe restrictions upon this idea.
14.
A perfect black body in thermodynamic equilibrium absorbs all light that strikes it, and radiates energy according to a unique law of radiative emissive power for temperature, universal for all perfect black bodies.
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A perfect black body in thermodynamic equilibrium absorbs all light that strikes it, and radiates energy according to a unique law of radiative emissive power for temperature, universal for all perfect black bodies.
16.
If we assume a perfect black body but with a shape different from a sphere, let's say a sheet or disk in the space with one side exposed to the radiation and the other not.
17.
Kirchhoff's original contribution to the physics of thermal radiation was his postulate of a "'perfect black body "'radiating and absorbing thermal radiation in an enclosure opaque to thermal radiation and with walls that absorb at all wavelengths.
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As a consequence, Kirchhoff's perfect black bodies that absorb all the radiation that falls on them cannot be realized in an infinitely thin surface layer, and impose conditions upon scattering of the light within the black body that are difficult to satisfy.
19.
This is the temperature of the Earth if it radiated as a perfect black body in the infrared, ignoring greenhouse effects ( which can raise the surface temperature of a body above what it would be if it were a perfect black body in all spectrums ), and assuming an unchanging albedo.
20.
This is the temperature of the Earth if it radiated as a perfect black body in the infrared, ignoring greenhouse effects ( which can raise the surface temperature of a body above what it would be if it were a perfect black body in all spectrums ), and assuming an unchanging albedo.
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