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

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What is light ? ± Dual nature: wave and particles electromagnetic theory, quantum theory, unified theory ± Visual sensation ± Electronic process
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Black body at 800 K Solar radiation at atmosphere’s boundaries 0 0.5 1.0 1.5 2.0 2.5 0 0.5 1.0 1.5 2.0 - - - Wavelength [ μ m] visible UV IR Clear sky, sun at 30° above the horizon Solar radiation at sea level - - Energy [kW/(m²· μ m)] Solar radiation
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Solar radiation Black body at 800 K Solar radiation at atmosphere’s boundaries 0 0.5 1.0 1.5 2.0 2.5 0 0.5 1.0 1.5 2.0 - - - Wavelength [ μ m] visible UV IR Clear sky, sun at 30° above the horizon Solar radiation at sea level - - Energy [kW/(m²· μ m)] Ground Reflection 5% Cloud Reflection 20%+ Atmospheric Absorption & Scattering 25% Figure by MIT OCW.
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Blackbody radiation ± Radiation only dependent on T° ± Theoretical object energy emitted is reabsorbed maximal power radiation ± Stefan-Boltzmann law radiated power per unit area = σ T 4 Figure by MIT OCW.
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Color temperature
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Color temperature
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Color temperature
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Color temperature
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Color temperature
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Color temperature ± ± Source requirements continuous spectrum color T° 5500°K only fulfilled by daylight Color temperature and visible emission < 5500 °K 5500°K > 5500°K
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