Blackbody radiation | Physics | Khan Academy

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A blackbody is an idealized object that absorbs all electromagnetic radiation (light) that shines on it. Blackbodies do not perpetually warm up as they absorb light because the accelerating charged particles inside them radiate their own light. The spectrum radiated by a blackbody depends only on its temperature. The hotter a blackbody is, the more intense its radiation is, and the shorter its peak wavelength is. The relationship between temperature and spectrum is used to estimate a star's surface temperature based on its color.

Sections:
00:00 - Intro
00:44 - Thermal radiation
03:19 - Blackbody radiation
05:11 - Axes of blackbody radiation graph
06:54 - Blackbody radiation at room temperature
08:10 - Blackbody radiation at 3000 K
10:52 - Blackbody radiation at 5800 K
12:33 - Blackbody radiation at 8000 K
13:32 - Blackbody color temperature chart

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