## What is "black body radiation?"

(Wien's law: $T\lambda _{max}=\frac{1}{5}C_{2}$ )

Chem_Mod
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### What is "black body radiation?"

Question: What is "black body radiation"?

Chem_Mod
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### Re: What is "black body radiation?"

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?"

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?"

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?"

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.

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### Re: What is "black body radiation?"

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?"

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?"

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.

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

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.