PHYSICS UNIT. Objects that PRODUCE light are LUMINOUS EX. light bulbs NON-LUMINOUS objects DO NOT produce their own light EX. moon.

OPTICSPHYSICS UNIT

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

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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

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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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