mse21 - Chapter 21 Optical Properties ISSUES TO ADDRESS...

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1 Chapter 21 - 1 ISSUES TO ADDRESS... What happens when light shines on a material ? Why do materials have characteristic colors? Optical applications: -- luminescence -- photoconductivity -- solar cell -- optical communications fibers Why are some materials transparent and others not? Chapter 21: Optical Properties Chapter 21 - 2 Optical Properties Light has both particulate and wavelike properties – Photons - with mass λ = ν = Δ hc h E m/s) 10 x (3.00 light of speed c ) s J 10 62 . 6 ( constant s Planck' frequency wavelength energy 8 34 = = = ν = λ = Δ x h E
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