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luminous object: something that produces its own light

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. 1. Incandescence : light that is emitted from a very hot object.

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luminous object: something that produces its own light

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  1. luminous object: something that produces its own light The Moon is bright only because it reflects the Sun’s light. Therefore, the Moon is NOTluminous.

  2. 1. Incandescence: light that is emitted from a very hot object

  3. 2. Luminescence: light that is generated without heating the object - types: a)electric discharge neon lights sodium vapour lamps

  4. Bohr Model of the Hydrogen Atom

  5. LEDs (light-emitting diodes)

  6. b)chemiluminescence: light that is produced by a chemical reaction without a rise in temperature

  7. c)bioluminescence: light that is produced by a biochemical reaction in a living organism

  8. 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

  9. Efficiency of Fluorescent Vs. Incandescent Bulbs

  10. 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.

  11. Because they contain mercury, used fluorescent lamps CANNOTbe thrown in the garbage. In Oakville, Rona & The Home Depot will take back your used fluorescent bulbs.

  12. Uses of Fluorescence money black light theatre fluorescent fish forensic science

  13. 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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