lec3 - What is light ? Dual nature: wave and particles...

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Unformatted text preview: What is light ? Dual nature: wave and particles electromagnetic theory, quantum theory, unified theory Visual sensation Electronic process Black body at 800 K Solar radiation at atmospheres boundaries 0 0.5 1.0 1.5 2.0 2.5 0 0.5 1.0 1.5 2.0 - - - Wavelength [ m] visible UV IR Clear sky, sun at 30 above the horizon Solar radiation at sea level- - Energy [kW/(m m)] Solar radiation Solar radiation Black body at 800 K Solar radiation at atmospheres boundaries 0 0.5 1.0 1.5 2.0 2.5 0 0.5 1.0 1.5 2.0 - - - Wavelength [ m] visible UV IR Clear sky, sun at 30 above the horizon Solar radiation at sea level- - Energy [kW/(m m)] Ground Reflection 5% Cloud Reflection 20%+ Atmospheric Absorption & Scattering 25% Figure by MIT OCW. Blackbody radiation Radiation only dependent on T Theoretical object energy emitted is reabsorbed maximal power radiation Stefan-Boltzmann law radiated power per unit area = T 4 Figure by MIT OCW. Color temperature Color temperature Color temperature Color temperature Color temperature Color temperature Source requirements continuous spectrum color T 5500K only fulfilled by daylight Color temperature and visible emission < 5500 K 5500K > 5500K Color temperature...
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lec3 - What is light ? Dual nature: wave and particles...

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