10.1 light energy and its sources
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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. - PowerPoint PPT PresentationTRANSCRIPT
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10.1 Light Energy and Its Sources
Text pages 289-293
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(Visible) Light
• A form of energy that can be detected by the human eye
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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
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Incandescence-make light by making
heat (very hot to touch!!)
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Luminescent things, by contrast, make light when their atoms
become excited in a process that needs little or no heat to make it
happen.
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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
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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
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Electric discharge: electricity passing through a gas
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Chemiluminescence: is the emission of light with very little heat as the result of a chemical reaction
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Bioluminescence is chemiluminescence in living
organisms
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