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What is light?? - PowerPoint PPT Presentation


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What is light??. Light is a form of energy that is created from a different form of energy There are two types Incandescence - Light from heat or high temperature Luminescence –Light from electron giving off energy https://www.youtube.com/watch?v= YnMP1Uj2nz0

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Light is a form of energy that is created from a different form of energy

  • There are two types
    • Incandescence- Light from heat or high temperature
    • Luminescence –Light from electron giving off energy
  • https://www.youtube.com/watch?v=YnMP1Uj2nz0
  • What are the source of light you know of and which one do you think it fits into?
luminescence sources
Luminescence Sources
  • Chemiluminescence- Light given off by a chemical reaction
  • Bioluminescence- Light given off by a chemical reaction within an organism
luminescence sources1
Luminescence Sources
  • Electroluminescence- Luminescence cause by electric currents
  • https://www.youtube.com/watch?v=BH9LI973H8w
  • Cathodoluminescence- Electroluminescence cause by electron beams
  • https://www.youtube.com/watch?v=qp6tNaUvfNI
luminescence sources2
Luminescence Sources
  • Fluorescence- Luminescence where energy is given off by the movement of electrons to non-excited state.
    • Electrons are found in atoms. They can get excited and take in energy. When they release that energy it comes off as light photons.
  • Phosphorescence- is a delayed light that is created because electrons are stuck in a high energy state and has not given off the energy as light yet.
  • https://www.youtube.com/watch?v=kLEHNYWQl68
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What types of light bulbs do you have in your house?

How often do the light bulbs need changing?

What are some factors that you think about when buying light bulbs?

slide9

http://energy.gov/public-services/homes/saving-electricity/lightinghttp://energy.gov/public-services/homes/saving-electricity/lighting

  • http://www.huffingtonpost.com/2014/03/30/daan-roosegaarde_n_5044578.html
exit slip
Exit slip
  • Which light bulb are you likely to buy now that we have compared some? What factors are the most important to you in a light bulb?
  • Explain in your own words what is the difference between Luminescence and Incandescence light sources.
  • What is bioluminescence?