Sources Of Light

Question 1

Natural light

Answer 1

Light produced by natural things like the sun and stars

Question 2

Artificial light

Answer 2

Light produced through human technology

Question 3

Incandescent light

Answer 3

Light produced by an object eg meyal that is at a very high temperature

Question 4

Parts of incandescent light

Answer 4

Filament
Thin piece of wire inside
Current flows through to create a high temperature and also releases light

Question 5

Incandescent light problems

Answer 5

Inefficient 5% of energy is light

Question 6

Fluorescent light

Answer 6

Light emitted by some substances when exposed to electromagnetic radiation

Question 7

Parts of fluorescent light

Answer 7

Glass tube
Gas metcury
Phosphor white powder glows after being exposed to energized particles

Question 8

Process of fluorescent light

Answer 8

Electric current energized gas atoms
Emits ultraviolet radiation
Hits the phosphor and it glows
More efficient 20% light

Question 9

Phosphorescence

Answer 9

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

Question 10

Chemiluminescence

Answer 10

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

Question 11

Tribuminescemce

Answer 11

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

Question 12

Electric discharge

Answer 12

Method to produces light where electric current passes through air or another gas eg neon
Ex lighting p

Question 13

Carbon arc

Answer 13

Produce searchlights beams
Can reflect off bottom of high clouds
Pass electric current between air or other gas between 2 carbon rods