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COLOR

COLOR. MIHA LEE. Sun Light. Visible Light. Color is the visual perceptual property in humans. Typical human eye responds to wavelengths to 300~700nm. Three ways of Interaction. Transparency => Transmission of light without scattering Translucency

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COLOR

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  1. COLOR MIHA LEE

  2. Sun Light

  3. Visible Light • Color is the visual perceptual property in humans. • Typical human eye responds to wavelengths to 300~700nm.

  4. Three ways of Interaction • Transparency => Transmission of light without scattering • Translucency => Transmission of light with scattering • Opacity => Absorption (and/or) Reflection

  5. Color of material • Color is the visible light that is reflected or emitted by a material. • Color as reflected (not absorbed)light • Color as emitted light

  6. Absorption & Emission of Light=> Transition of Electrons

  7. Indicator • Indicators are usually weak acids. • HIn  H+ + In- (In an acid solution) (In a base solution) • Le Chatelier’s principle

  8. Tomato Juice • Tomato has lycopene which has a lot of conjugated double bonds. • When lycopene undergoes chemical reactions, the color of tomato juice will be changed.

  9. Color as Reflected Light • Part of the white light is absorbed and the rest of visible light is reflected. • A substance absorbs some wavelengths of visible light preferentially. • Color of a substance depends on its molecular structure. • Organic dyes and pigments.

  10. Color as Emitted light • Usually, the absorbed light change into heat in a substance. • However, some special substances have an ability to give off some specific color of visible light in a certain condition. • Fluorescence • Phosphorescence

  11. Flame Reaction • Flame reaction is a reaction of some elements. • Those elements absorb heat energy in a flame, and emit specific wavelengths of visible light. • Flame reaction is a kind of Fluorescence.

  12. Flame Reaction

  13. Size Quantization Effects

  14. Fluorescent Lamp

  15. Phosphorescence • A process in which light energy absorbed by a substance is stored and released relatively slowly in the form of light.

  16. Glow in the Dark

  17. Color • A color of a substance depends on the structure of its molecule or atom. • The transition of electrons in electronic orbital states shows the specific color. • There are many substances that don’t have colors because their transitions occur out of the visible range.

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