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Science8 Unit C Lightand Optics Section3 Lesson6 Visible Light
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Science8 Unit C Lightand Optics Section3 Lesson6 Visible Light

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Additive Colour Theory …

Additive Colour Theory
Artificial Sources of Light
Natural Sources of Light
Visible Light
Colour Filters

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Transcript

  • 1. Light is part of the electromagnetic spectrum and travels in waves
  • 2.
    • Lesson #6, Section 3.3-3.4. Pages 221-229
    • Learner Outcomes
    • I can evaluate, compare, and contrast different artificial and natural light sources
    • I can describe how primary colours can be added to produce different colours and white light
  • 3.
    • ROY-G-BIV
  • 4.
    • Radiation is the wave like transfer of light from its source in all directions.
    • Light is often called radiant energy .
    • Light from the sun is formed by nuclear fusion .
  • 5.
    • Light is a form of energy When light reaches a surface, it can be absorbed and transformed into other types of energy.
    • … into electrical energy
    • … into thermal energy
    • … into chemical energy
  • 6.
    • The amount of energy a surface receives depends on the intensity of the light.
    • The more intense the light, the more light can be absorbed.
  • 7.
    • NATURAL LIGHT SOURCE
    • ARTIFICIAL LIGHT SOURCE
    • Sun
    • Nuclear Fusion  Thermal Energy  Visible Light Energy
    • Incandescent (heat causing a filament of metal to glow - visible light)
    • Electrical energy  Thermal energy  Visible light energy
  • 8.
    • NATURAL LIGHT SOURCE
    • ARTIFICIAL LIGHT SOURCE
    • Candles or Oil Lamps
    • Chemical energy  Thermal Energy  Visible light energy
    • Florescent (ultraviolet light is absorbed by fabric particles, which in turn emit some of the energy as light - glowing)
    • Ultraviolet light  Energy absorbed  Visible light energy/particles energy
  • 9.
    • NATURAL LIGHT SOURCE
    • ARTIFICIAL LIGHT SOURCE
    • Wood (fire)
    • Chemical energy  Thermal Energy  Visible light energy
    • Phosphorescent (light energy is stored and released later as visible light) paint
    • Chemical energy  Visible light energy
  • 10.
    • NATURAL LIGHT SOURCE
    • ARTIFICIAL LIGHT SOURCES
    • Bioluminescence (light produced by living organisms)
    • Chemical energy  Visible light energy
    • Chemiluminescent (light energy released by chemical reactions) glow sticks
    • Chemiluminescence
    • Movies (Shockwave/Flash)
    • Chemical energy  Visible light energy
  • 11.
    • Incandescent light bulbs produce far more heat than light, or more infrared radiation than visible light energy. 95% heat vs. 5% light
    • Fluorescent bulbs are more efficient. 80% heat vs. 20% light
  • 12.
    • Read page 224 and complete this activity in groups of 3-5 people
    • Make sure you observe safety protocols
  • 13.
    • ... evaluate, compare, and contrast different artificial and natural light sources?
  • 14.
    • #1. Explain how an incandescent light bulb works. ____________________________________________________________________________________
    • #2. Your watch dial may have glow in the dark numbers. Is this phosphorescence or fluorescence? Explain your answer. ________________________________________________________________________________________________________________________________________________________________________
  • 15.
    • #3. Why would a business choose fluorescent instead of incandescent lights? ____________________________________________________________________________________
    • #4. What is bioluminescence? Provide at least two examples. ______________________________________________________________________________________________________________________________
  • 16.
    • The various colors of the visible spectrum have slightly different wavelengths and refract by a slightly different amount.
    • The Primary colors of the visible spectrum are red , green and blue .
  • 17.
    • The Primary colors of the visible spectrum are red , green and blue .
    • Secondary colors are cyan , magenta and yellow .
    • The mixing of three colors of light to produce many different colors of light is called the theory of color addition.
  • 18.  
  • 19.
    • Television puts the theory of color addition into practice.
    • By changing the brightness of the dots that make up the screen many different colors can be produced.
    • The television works by fooling the eye into seeing colors that are not really there.
  • 20.
    • The colour an object appears depends on the colours of light it reflects.
    For example, a red book only reflects red light: White light Only red light is reflected Homework
  • 21. A white hat would reflect all seven colours: A pair of purple trousers would reflect purple light ( and red and blue, as purple is made up of red and blue): Purple light White light
  • 22.
    • If we look at a coloured object in coloured light we see something different
    White light Shorts look blue Shirt looks red
  • 23.
    • Filters can be used to “block” out different colours of light:
    Red Filter Magenta Filter
  • 24.
    • ... describe how primary colours can be added to produce different colours and white light?
  • 25.
    • #1. What are the primary colours of light? How is white light produced? ________________________________________________________________________________________________________________________
    • #2. Explain how a prism can determine what white light is composed of? ________________________________________________________________________________
  • 26.
    • #3. You are a lighting technician in a theatre. The director asks for magenta light on stage, but you only have red, blue, and green lights. What could you do to produce magenta light? ________________________________________________________________________________________________________________________________________________________________________________________________________