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Chapter 28 Outline

Chapter 28 Outline. Mr. Gaydos May 5 – 9, 2014. Chapter 28 Outline Major Topics. I. Introduction II. The Color Spectrum III. Color by Reflection IV. Color by Transmission V. Sunlight VI. Mixing Colored Light VII. Complementary Colors

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Chapter 28 Outline

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  1. Chapter 28 Outline Mr. Gaydos May 5 – 9, 2014

  2. Chapter 28 OutlineMajor Topics I. Introduction II. The Color Spectrum III. Color by Reflection IV. Color by Transmission V. Sunlight VI. Mixing Colored Light VII. Complementary Colors VIII. Mixing Colored Pigments IX. Why the Sky is Blue X. Why Sunsets are Red XI. Why Water is Greenish Blue XII. The Atomic Color Code - Atomic Spectra

  3. Chapter 28 Outline I. Introduction: Is color real? or is Color is in theeyes of the Beholder Howdoweperceivecolor?

  4. Chapter 28 Outline II. The Color Spectrum: (Section 28.1) A. The Color Spectrum vs. the EM Spectrum B. Is White Light really the “color” White? C. Black is Black? D. Important Terms: 1. Color Spectrum: the spread of “Colors” (Frequencies of light) in the range of visible 2. White Light : A mixture of ALL colors. 3. Black: the absence of ALL color

  5. Chapter 28 Outline III. Color by Reflection: (Section 28.2) A. Color of most objects is perceived via reflection of light at certain frequencies. B. Similar to resonating a Tuning fork at its “Natural Frequency”. C. Light excites atoms in objects at their natural frequencies causing vibrations. D. Some energy is absorbed, some is reemitted at those natural frequencies of visible light (Colors)

  6. Chapter 28 Outline IV. Color by Transmission: (Section 28.3) A. Specific light frequencies that pass through a Transparent material. B. All the rest are absorbed by the material. (Fig. 28.6 in Text Book) C. Important Terms: Pigment: Selective absorption of colored light.

  7. Chapter 28 Outline V. Sunlight: (Section 28.4) A. Light from the sun: “White Light” B. Spectrum & Intensity or Brightness: (Fig.28.7 on pg. 426 for Textbook) C. Human eyes most sensitive to “Green”

  8. Chapter 28 Outline VI. Mixing Colored Light A. White Light All Colors B. Overlap Red, Green, Blue LIGHT = ??? White C. Primary Colors: RGB D. Important Terms: Additive Primary Colors: R+G+B = W

  9. Chapter 28 Outline VII. Complementary Colors: YMC A. Mixing Primary Colors, RGB: 1.Red+Green= Yellow. 2. Red+ Blue = Magenta, 3. Blue+Green= Cyan B.Mixing Complementary colors with Primaries: 1. Yellow + Blue = White 2. Magenta +Green= White 3. Cyan + Red = White C. Important Terms: Complimentary Colors: Two colors added together to produce white light

  10. Chapter 28 Outline VII. Mixing Colored Pigments (Section 28.7) A. Mix RGB Paint: 1. Result = White ??? Muddy Brown 2. Why ??? Mixing Paints or Dyes not the same process as mixing colored light

  11. Chapter 28 Outline VII. Mixing Colored Pigments (continued) B. Behavior of Paints & Dyes 1. Paints & Dyes contain finely divided solid particles of pigment 2. Light reflection & absorption is over a relatively wide range of frequencies or colors. (Not a single frequency or color) 3. Ex. Blue Paint: a. Reflects Blue, violet & green light. b. Absorbs red, orange & yellow light.

  12. Chapter 28 Outline VII. Mixing Colored Pigments (continued) C. Important Terms: 1. Pigment: A material that selectively absorbs colored light. 2. Subtractive Primary Colors: Magenta, Yellow, Cyan 3.Color Printing is performed using Magenta, Yellow, Cyan &Black

  13. Chapter 28 Outline IX. Why is the Sky Blue? (Section 28.8) A. Higher Frequencies of light (Blue, Violet) are scattered by molecules in the atmosphere. B. Ultraviolet Waves absorbed by Protective Ozone Layer 1. What is Ozone 2. O3 C. Important Terms: Scatter

  14. Chapter 28 Outline X. Why Sunsets are Red A. Sunlight passing through more of the atmosphere than during the day. B. Rays encounter more particles larger than Oxygen & Nitrogen

  15. Chapter 28 Outline C. Atmospheric Diagram Rays of Sunlight

  16. Chapter 28 Outline XI. Why Water is Greenish Blue A. Water Absorbs Red Light 1. Water Molecules Resonate when exposed to Red light 2. When Red light is subtracted from white light, Cyan results. Why? 3. Red + Cyan = White Cyanis a Complementary color of Red

  17. Chapter 28 Outline XII. The Atomic Color Code: Atomic Spectra A. Line Spectra: Each line corresponds to a specific element. B. Used to identify composition of substances. C. Important Terms 1. Line Spectra 2. Spectroscope

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