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4 questions
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Heat transfer and Stefan-Boltzmann law and black body radiation [closed]
can there exist a black body (theoretically) which has a cavity in it I don't mean Fery's black body I am referring to a black body which is made of a MATERIAL which has the property to emit and ...
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-1
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1
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Confused about finding earths temperature through the sun's heat output value [closed]
I encountered this problem in my textbooK:
"The Sun has the radius of 700,000km and a surface temperature of 5800K. The Earth is 150,000,000km far from the Sun and it has the radius of 6400km. In ...
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1
vote
1
answer
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Irradiance on a surface
I would like to calculate the irradiance incident upon a cca. 2x2 cm surface from 2 different radiating sources.
a 30x32 cm plane surface at 30.5 °C, at a distance of 70 cm,
a 5x10 cm plane surface, ...
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0
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1
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Deriving Wien's displacement law (Zettili)
According to Zettili, we can derive Wien's displacement law from Planck's energy density
$$
\tilde{u}(\lambda, T) = \frac{8\pi hc}{\lambda^{5}}\frac{1}{e^{hc/kT\lambda}-1}
$$
where $\lambda$ is the ...
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