What is "black body radiation?"

(Wien's law: )

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Chem_Mod
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What is "black body radiation?"

Postby Chem_Mod » Thu Aug 25, 2011 9:51 am

Question: What is "black body radiation"?

Chem_Mod
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Joined: Thu Aug 04, 2011 1:53 pm
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Re: What is "black body radiation?"

Postby Chem_Mod » Thu Aug 25, 2011 9:51 am

Answer: "Black body radiation" refers to the radiation that originates from the thermal energy of the body that is heated.

rachaeld_1D
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Re: What is "black body radiation?"

Postby rachaeld_1D » Thu Oct 09, 2014 3:48 pm

Do we just have to know this about black body radiation for chem 14A?
Chem_Mod wrote:Answer: "Black body radiation" refers to the radiation that originates from the thermal energy of the body that is heated.

Justin Le 2I
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Re: What is "black body radiation?"

Postby Justin Le 2I » Wed Oct 15, 2014 1:53 am

I think we just need to know what black body radiation is and the Stefan-Boltzmann law which is Total intensity = constant x T^4. I would focus on problem 1.13 from the textbook.

Anna Nordstrom 1A
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Re: What is "black body radiation?"

Postby Anna Nordstrom 1A » Thu Oct 01, 2015 8:28 am

A "Black Body" is a hypothetical substance that absorbs all light, regardless of frequency or angle that it is entering at. Black Body radiation is the radiation that would come from this hypothetical substance.

alexandrad 3J
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Re: What is "black body radiation?"

Postby alexandrad 3J » Thu Oct 01, 2015 3:46 pm

Black body radiation is basically the radiation emitted from a hot object(black body) at different wavelengths during a series of different temperatures. It also emits radiation at the same rate it absorbs it.

Jessica Sims 3E
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Re: What is "black body radiation?"

Postby Jessica Sims 3E » Thu Oct 01, 2015 7:34 pm

In Wein's Law it is stated that the wavelength corresponding to the maximum intensity is inversely proportional to the temperature, but the graph in the text book seems to suggest that at the same wavelength as temperature goes up so does the energy of the equation. How are these two points consolidated, or am I misinterpreting the graph?

Janae Yip 3G
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Re: What is "black body radiation?"

Postby Janae Yip 3G » Fri Oct 02, 2015 12:15 am

Remember that a wavelength is inversely related to the amount of energy. Eg. shorter wavelength=higher frequency=higher energy. Therefore, it makes sense that as temperature goes up, the energy also goes up while the opposite happens to the wavelength.

I think this link explains it pretty well: http://www.astro.cornell.edu/academics/ ... ns_law.htm

Erin Murashige 1L
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Re: What is "black body radiation?"

Postby Erin Murashige 1L » Fri Oct 02, 2015 12:24 am

Since the wavelength corresponding to the maximum intensity are inversely proportional to temperature, Figure 1.14 shows that the temperature is rising as maximum wavelength is getting smaller. It shows how 1/Temperature decreases and passes over 400K all the way down to 100K, so it is still inversely proportional and Wien's law will be a constant.


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