L33 - Colored objects and color filters Lecture 33 How...

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Lecture 33 How Absorbing: Light and color Key Idea: Color arises when light energy interacts with a compound to change the location of an electron. Colored objects and color filters Reflection, absorption and transmission of light reflection of red laser beam The shirt looks red because it reflects red light and absorbs almost all other colors http://chemistry.beloit.edu/BlueLight/applets/absorption/index.html Visible white light consists of many colors Wave properties of light Wave properties of light ! : wavelength, [m] " : frequency, [s -1 , Hz] c : speed [m/s] ! ! " = = c c = 3.0 x 10 8 m/s, speed of light ! distance " # 1 time Energy: E = E = h " = h = h c ! h [Js] is Planck’s constant Light of different colors has different wavelengths " (Hz, s (Hz, s -1 -1 ) 4.3 x 10 14 5.0 x 10 14 6.0 x 10 14 6.9 x 10 14
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Our eyes can only see electromagnetic radiation of a very small range of wavelengths 1 eV corresponds to 96.5 kJ/mol Light is a propagating electromagnetic wave Unlike water or acoustic waves, light does not require any “sustaining medium”. Cone receptors come in 3 types; the brain
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L33 - Colored objects and color filters Lecture 33 How...

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