Planck's Law / Black Body Spectrum

Cal Teach student assistant Kibeum Ryoo does an activity on infrared star detection with high school students at the 2009 BCCP Cosmology Workshop. An experiment using an infrared thermometer that simulated Infrared Spectroscopy illustrated a fundamental concept of black body radiation. In this activity, students use an Infrared thermometer to simulate how infrared telescopes determine the temperature of stars.
In physics, Planck's law describes the spectral radiance of electromagnetic radiation at all wavelengths from a black body. Max Planck was a German physicist considered to be the founder of the quantum theory. Planck was awarded the Nobel Prize in Physics in 1918.
http://bccp.lbl.gov/Academy/workshop3.html

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• cosmology
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• spectrum
• thermal
• radiation
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• electromagnetic
• infrared
• star
• detection
• galaxy
• student
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• Berkeley
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• yt:quality=high

[j0se1991]

i suppose that this classes is for students of first semester in that university, they're playing because this isn't physics

[artysci101]

@j0se1991 - they're high school students at a 2 week cosmology workshop

[thedarkholeconsumer]

@heltzarr lol agreed

[heltzarr]

It was a great demonstration. But the guy who was talking was the WORST at describing things.

[itachiLUVZgulsan]

@JuanVoyce the radiation is seen as bright light, above the visible spectrum

[JuanVoyce]

@lundburgerr OK amplitude = 4th power of T, but doesn't it also show that T is directly related to the wave length--and that above 7000k the BB radiation would not be visible since it shifts left into the UV?

[lundburgerr]

@JuanVoyce

The curves on the graph represents the intensity of various wavelengths of light at different black body temperatures.

In this graph (at the beginning) they took the curves for 3000K, 4000K, 5000K, 6000K and 7000K as an example You could obviously draw curves for temperatures above 7000K aswell :).

However, what you should expect from the curves is that if the temperature doubles, the body should emit 16 times more light and the curve should also move to the left of the graph.

[JuanVoyce]

So what happens if the blackbody is heated above 7000K?