Chauvin Arnoux C.A 1875, Руководство пользователя

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61
Wien's law gives the wavelength (in micrometers) corresponding to the maximum
radiated energy of a black body at a specified temperature T (in Kelvin).
2898
λ
max
=
T
The wavelength of the infrared radiation maximum decreases as the temperature of
the black body increases.
The Stefan-Boltzmann law is used to quantify these exchanges. The energy E
radiated by a body is written:
E = S. σ . T
4
With:
E: radiated energy expressed in W/m².
σ : Stefan-Boltzmann constant = 5.6703 x 108 W.m
-2
.K
-4
S: area of the body expressed in m²
T: temperature of the body in Kelvin
A black body is a body of which the surface absorbs all radiation received.
NB: a black body is not a real thing, but an idealized object from which the only
outgoing radiation is thermal radiation, determined solely by the body's own
temperature.
Application: see appendix 3, exercises 3 and 4
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