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How is light produced?

How is light produced?. Luminous: objects that emit their own light i.e. the sun, a flashlight turned on. Nonluminous : objects that do not emit light i.e a flashlight switched off. Luminous Sources of Light.

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How is light produced?

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  1. How is light produced?

  2. Luminous: objects that emit their own light i.e. the sun, a flashlight turned on

  3. Nonluminous: objects that do not emit light i.e a flashlight switched off

  4. Luminous Sources of Light

  5. Light from Incandescence: the process of emitting light because of a high temperature i.e. light bulb, fire • electrical charges move through the filament in the bulb to make it heat up and glow

  6. Light from Incandescence • As an object gets hotter and hotter it will eventually produce light (can be different colours depending on temp.) Red  Orange  Yellow  White Bluish white Hot------------------------ Hottest

  7. Light from Electrical Discharge: the process of emitting light because of electricity passing through a gas i.e. lightning, neon signs

  8. Light from Phosphorescence: an object that can emit light for a period of time after light has been shined on it. • i.e. the hands and numbers of a watch, some glow in the dark toys

  9. Light from Fluorescence: the process of emitting light while receiving energy from a different source i.e. fluorescent light bulbs

  10. Light from Chemiluminescence: the process of changing chemical energy into light energy with little change in temperature i.e. glow sticks

  11. Light from Bioluminescence: a chemical reaction that takes place inside a living organism that makes them emit light i.e. bacteria, fungi, fireflies etc • Almost 70% of deep-sea fish are bioluminescent!

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