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luminous object: something that produces
its own light The Moon is bright only because it reflects the Sun’s light. Therefore, the Moon is NOT luminous.
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1. Incandescence: light that is emitted from a very hot object
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2. Luminescence: light that is generated without heating the object
- types: a) electric discharge neon lights sodium vapour lamps
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Bohr Model of the Hydrogen Atom
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LEDs (light-emitting diodes)
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b) chemiluminescence: light that is produced by a chemical reaction
without a rise in temperature
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c) bioluminescence: light that is produced by a biochemical
reaction in a living organism
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d) fluorescence: light that is emitted during exposure of the source
to ultraviolet (UV) light and mercury tubular fluorescent light bulb compact fluorescent light (CFL) bulb
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Efficiency of Fluorescent Vs. Incandescent Bulbs
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Even though fluorescent bulbs are 4X as efficient as incandescent
bulbs (20% vs. 5%) , some people don’t like them because: they find the light from fluorescent bulbs to be harsh. these lamps contain small amounts of mercury vapour, a toxic metal.
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Because they contain mercury, used
fluorescent lamps CANNOT be thrown in the garbage. In Oakville, Rona & The Home Depot will take back your used fluorescent bulbs.
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Uses of Fluorescence money black light theatre fluorescent fish
forensic science
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e) phosphorescence: light that is emitted due to exposure of
the source to UV light, and that continues to be emitted for some time in the absence of the UV light
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Reflection diagram
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Characteristics of Images
Size bigger or smaller Attitude upright or inverted Location closer or farther Type real or virtual
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Curved mirrors
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Lens and mirror equation
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Refraction diagram
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C-speed of light in a vacuum 3.0 x 10 8m/s V-speed of light in medium
Index of refraction n =c/v C-speed of light in a vacuum 3.0 x 10 8m/s V-speed of light in medium
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Internal reflection
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Lenses
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Diverging lens
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The eye
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Colour Theory
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