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

ashwathinair
Posts: 113
Joined: Sat Aug 17, 2019 12:17 am

Exactly what is black body radiation, and what do I need to know about it?

Jiyoon_Hwang_2I
Posts: 101
Joined: Sat Sep 14, 2019 12:17 am

Black body radiation is emitted by an object (the "black body") which absorbs all frequencies of light and emits radiation solely based on the wavelength rather than the composition of the object. However, I believe Dr. Lavelle said we don't need to know what black body radiation is.

ckilkeary 2G
Posts: 68
Joined: Fri Aug 09, 2019 12:16 am

Black body radiation is what is emitted at different wavelengths by an object heated for a series of temperatures that does not prefer one wavelength over another in terms of absorption. The only time we really mentioned black body in lecture was to say that the description of light as photons explains the intensity profile of black body radiation. I don't think we'll have to know the Stefan-Boltzmann Law, and we probably won't have to know Wien's Law (but just in case) which is T*λ(max) = constant

T: temperature
λ(max): max wavelength
constant: 2.9 mm*K

sbeall_1C
Posts: 109
Joined: Sat Sep 07, 2019 12:17 am
Been upvoted: 1 time

Also, studies of black body radiation led to Planck's hypothesis of the quantization of electromagnetic radiation, which the photoelectric effect then provides evidence of the particle like properties of electromagnetic radiation. Black body radiation, therefore, helped guide research toward discovery of the wave-particle duality of light.

Mai V 4L
Posts: 111
Joined: Fri Sep 28, 2018 12:23 am

Does anyone have a video they think is a good reference for this topiic?

Xavier Herrera 3H
Posts: 67
Joined: Wed Sep 30, 2020 9:37 pm

So, just to make sure I understand correctly, a black body absorbs all frequencies of light and emits radiation based on the incoming wavelength of light, so it can emit any wavelength of light. This emission from the black body is the black body radiation.

t_rasul2I
Posts: 69
Joined: Wed Sep 30, 2020 9:38 pm

Black body radiation is essentially a "theoretical or model body which absorbs all radiation falling on it, reflecting or transmitting none back. it has something to do with temperature. it won't be covered on the midterm though I believe

tholz11
Posts: 59
Joined: Wed Sep 30, 2020 9:38 pm

Black Body radiation is a theoretical concept, because no such object actually exists with these properties. However, in theory a black body is able to absorb any frequency of light and emit radiation at any wavelength. Any emission is called black body radiation.

Jeremy Wei 2C
Posts: 53
Joined: Wed Sep 30, 2020 9:59 pm