New answers tagged thermal-radiation
2
The role of the atomic structure of the black body has its importance, as it will determine how the light is absorbed. And a black body is defined as matter that absorbs everything. However, matter will always absorb a little bit, and reflect or disperse the rest. Having a little hole allows for light to bounce many times after entering, every time absorbing ...
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Let us compare thermal equilibrium radiation you have described and the black body radiation.
Take an object B at thermal equilibrium (not necessarily a black body), and denote with $\varepsilon(\lambda)$ the fraction of radiation of wavelength $\lambda$ it absorbs.
Thus if $a(\lambda)$ of radiation of the wavelength $\lambda$ falls on B, it absorbs
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This site might help in clearing up the concepts, which are not simple. In the link, click "heat and thermodynamics" and then " radiation" and then "black body" on the right column to get the options shown in the image. Unfortunately the site does not link back to individual pages. :(.
Clicking on the main line,
Blackbody radiation" or "cavity ...
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A Bunsen Burner typically uses methane, butane, propane or another alkane and these burn blue.
The Wikipedia article on butane has a spectrum showing the $\mathrm{CH}$ radical as the primary source of blue emission:
You should consult Chemistry.SE for more details on why they burn blue.
Bunsen burners are designed to mix air into the gas before ...
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The peak wavelength at which a body emits light is governed by Wien's displacement law, which states that this wavelength is inversely proportional to the temperature, as
$$\lambda \, T=\text{const}=0.003\text{ m K}.$$
More graphically, in the stellar-surface sort of temperature range, this looks like
You'll notice that although the short-wavelength ...
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The wiki article has a lucid calculation of what you are asking.
Notice that this is the incident power, and somewhwere the book must say per meter square on the target.
Incident and absorbed are two different concepts.
The incident/incoming radiation is computed at the location of the earth, so it depends only on the parameters of the sun and the ...
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