Black Body
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Re: Black Body
Professor Lavelle said a black body is a hypothetical material that can absorb all frequencies of light (it's not real).
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Re: Black Body
According to the textbook, a black body is an object that absorbs and emits all frequencies of radiation without favor. The object that is heated, or the "hot object," is known as the black body.
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Re: Black Body
So does the concept of black bodies explain why objects go from being red hot to being white hot?
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Re: Black Body
Do we have to understand the concepts of black body for the midterms? I don't remember Professor Lavelle going over this thoroughly or at all during class?
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Re: Black Body
I believe he mentioned in class that we don't need to know about black bodies, so I wouldn't worry too much about studying them. It's also not on the course outline!
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Re: Black Body
The professor said we do not need to know this for this course (14a) but might for later courses.
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Re: Black Body
so does that mean we don't need to know about the Stefan-Boltzmann law or Wien's law?
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Re: Black Body
The sun is an example of an "almost" black body (since true black bodies do no exist) because it emits almost every wavelength of light.
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Re: Black Body
To add on to these comments, I would like to mention that black bodies absorb a wide range of wavelengths (unlike individual atoms) because the atoms and electrons in black bodies act collectively.
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