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10.1 Light Energy and Its Sources

10.1 Light Energy and Its Sources. Text pages 289-293. (Visible) Light. A form of energy that can be detected by the human eye.

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10.1 Light Energy and Its Sources

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  1. 10.1 Light Energy and Its Sources Text pages 289-293

  2. (Visible) Light • A form of energy that can be detected by the human eye

  3. What is luminescence?Luminous simply means giving off light; most things in our world produce light because they have energy that originally came from the Sun, which is the biggest, most luminous thing we can see

  4. Incandescence-make light by making heat (very hot to touch!!)

  5. Luminescent things, by contrast, make light when their atoms become excited in a process that needs little or no heat to make it happen.

  6. Fluorescence: the emission of light by a substance that has absorbed light (or other electromagnetic radiation of a different wavelength)= lower in temperature= Fluorescent materials produce light instantly= need to have electricity passed through them to keep them glowing

  7. is a specific type of luminescence related to fluorescence. Unlike fluorescence, phosphorescence is a process in which energy absorbed by a substance is released relatively slowly (there is a delay). The object “glows” for a much longer period of time than in fluorescence

  8. Electric discharge: electricity passing through a gas

  9. Chemiluminescence: is the emission of light with very little heat as the result of a chemical reaction

  10. Bioluminescence is chemiluminescence in living organisms

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