Sources Of Light Flashcards
Natural light
Light produced by natural things like the sun and stars
Artificial light
Light produced through human technology
Incandescent light
Light produced by an object eg meyal that is at a very high temperature
Parts of incandescent light
Filament
Thin piece of wire inside
Current flows through to create a high temperature and also releases light
Incandescent light problems
Inefficient 5% of energy is light
Fluorescent light
Light emitted by some substances when exposed to electromagnetic radiation
Parts of fluorescent light
Glass tube
Gas metcury
Phosphor white powder glows after being exposed to energized particles
Process of fluorescent light
Electric current energized gas atoms
Emits ultraviolet radiation
Hits the phosphor and it glows
More efficient 20% light
Phosphorescence
Ability to store energy from a source of light then emit it slowly for over a long period of time
Can glow in dark but fades
Can be reenergized in front of light
Chemiluminescence
Lift produced from chemical reaction without a rise in temp
Called cool light gives off very little heat
All forms of bioluminescence are special chemiluminescence
Used in glow sticks
Analyzing crime sciences lumin reacts with iron in blood
Tribuminescemce
Light produced from friction Glow sticks Crush crystals rub together sugar Rubbing diamond Ute aboriginals 30 pieces of quartz thin buffalo hide permits light to go through
Electric discharge
Method to produces light where electric current passes through air or another gas eg neon
Ex lighting p
Carbon arc
Produce searchlights beams
Can reflect off bottom of high clouds
Pass electric current between air or other gas between 2 carbon rods
