Posted On :

the Stefan–Boltzmann law states that the total energy radiated per unit surface area of a black body across all wavelengths per unit time (also known as the b lack-body radiant exitance or emissive power), J , is directlyproportional to the fou rth power of the black body's thermodynamic temperature T: Wien's displacementt law states that the black body radiation curve for different temperatures peaks at a waveelength inversely proportional to the temper ature.

**STEFAN****–****BOLTZMAN N LAW**

**Stefan****–****Boltzmann
law**,
also known as** Stefan's law**, describes the power radiated from** **a
black body in terms of itste mperature. Specifically, the Stefan–Boltzmann
law states that the total energy radiated per unit surface area of a black body
across all wavelengths per unit time
(also known as the b lack-body *radiant exitance* or *emissive power*),
J , is directlyproportional to the fou rth power of
the black body's thermodynamic temperature *T*:

**WIEN'S DISPLACEMEENT LAW**

**Wien's displacementt law **states
that the black body radiation curve for different** **temperatures peaks at
a waveelength inversely proportional to the temper ature. The shift of that
peak is a direct consequ ence of the Planck radiation law which des cribes the
spectral brightness of black body rad iation as a function of wavelength at any
given temperature. However it had been discovered by Wilhelm Wien several years
before Max Planck developed that more general equation, and describes the
entire shift of the spectrum of black body radiation toward shorter wavelengths
as temperature increases.

Formally,
Wien's displacement law states that the spectral radiance of black body
radiation per unit wavelength, peaks at the wavelength ?_{max}
given
by:

where *T* is
the absol ute temperature in degrees kelvin. *b* i s a constant of proportionality
called *Wie n's displacement constant*, equal
to 2.8 977721(26)×10* *^{?3}* *m K.^{[1]},
or more convenien tly to obtain wavelength in microns, b?2900
?m K. If one is considering the peak of black body emission per
unit frequency o r per proportional bandwidth, one must use a different
proportionality constant. However the form of the law remains the same: the
peak wavelength is inversely proportional to temperature (or the peak frequency
is directly proportional to temperature).

Wien's
displacement law may be referred to as "Wien's law", a term which is
also used for the Wien approximation.

Tags : Civil - Remote Sensing Techniques and GIS - EMR and Its Interaction With Atmosphere and Earth Material

Last 30 days 44 views
Related words : ### What is Stefan Boltzmann law and Wien's displacementt law Define Stefan Boltzmann law and Wien's displacementt law Definition of Stefan Boltzmann law and Wien's displacementt law where how
meaning of Stefan Boltzmann law and Wien's displacementt law
lecturing notes for Stefan Boltzmann law and Wien's displacementt law lecture notes question and answer for Stefan Boltzmann law and Wien's displacementt law answer
Stefan Boltzmann law and Wien's displacementt law study material Stefan Boltzmann law and Wien's displacementt law assignment Stefan Boltzmann law and Wien's displacementt law reference description of Stefan Boltzmann law and Wien's displacementt law
explanation of Stefan Boltzmann law and Wien's displacementt law brief detail of Stefan Boltzmann law and Wien's displacementt law easy explanation solution Stefan Boltzmann law and Wien's displacementt law wiki
Stefan Boltzmann law and Wien's displacementt law wikipedia how why is who were when is when did where did Stefan Boltzmann law and Wien's displacementt law list of Stefan Boltzmann law and Wien's displacementt law school assignment college assignment
Stefan Boltzmann law and Wien's displacementt law college notes school notes kids with diagram or figure or image difference between Stefan Boltzmann law and Wien's displacementt law www.readorrefer.in - Read Or Refer

Recent New Topics :