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Objects that PRODUCE light are LUMINOUS
EX. light bulbs
NON-LUMINOUS objects DO NOT produce their own light
EX. moon
1. Incandescence:
heating a substance to a very high temperature
Ex. Light bulb has metal wire (tungsten) that gets heated to 2200oC
HowStuffWorks "How Light Bulbs Work“
Nelson Science
2. Fluorescencehigh UV radiation gets absorbedex. highlighter markersFluorescent and Compact Fluorescent Lights (CFLs):mixture of mercury and argon gasesreleases less heat
3. LED (light-emitting diode) pass electrical current through them don’t heat up so stay cool most energy efficient ex. ‘new’ Christmas lights, digital
clocks…HowStuffWorks
"How Light Emitting Diodes Work"
4. Phosphorescence like fluorescence, energy gets absorbed however, gets released slowly over time ex. glow in the dark materials
YouTube - IAI Presentations Famous People Players
Steve Spangler Science - Tools and tips that make learning science fun!
5. Chemiluminescence chemical reaction that produces light ex. glow stick
6. Bioluminescence chemiluminescence in livng organisms ex. fireflies, jellyfish… HowStuffWorks
Videos "Cool Underwater Creatures"
7. Triboluminescence light produced when certain crystals
rubbed together or crused ex. eating Wintogreen Lifesavers in the
dark!
8. Electrical Discharge Produced by electrical current passing
through a gas causing gas to glow ex. neon lights, lightning
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