luminous sources & natural vs artifical light

Question 1

define natural light

Answer 1

light produced by natural sources

Question 2

define artificial light

Answer 2

produced by man made sources

Question 3

what is a luminous object

Answer 3

an object they produces its own light

Question 4

what is a non-luminous object

Answer 4

an object that does not produce its own light

Question 5

define incandescence

Answer 5

light emitted when a material is heated

Question 6

which luminous source matches the definition: light emitted when a material is heated

Answer 6

incandescence

Question 7

what is electric discharge

Answer 7

light passing electric current through gas

Question 8

which luminous source matches the definition: light passing electric current through gas

Answer 8

electric discharge

Question 9

what is phosphorescence

Answer 9

it absorbs UV light and emits it over a period of time

Question 10

which luminous source matches the definition: absorbs UV light and emits it over a period of time

Answer 10

phosphorescence

Question 11

what is fluorescence

Answer 11

it absorbs UV light and emits it immediately

Question 12

which luminous source matches the definition: absorbs UV light and emits it immediately

Answer 12

fluorescence

Question 13

what is chemiluminescence

Answer 13

light produced from chemical reaction

Question 14

which luminous source is light produced from a chemical reaction

Answer 14

chemiluminescence

Question 15

what is bioluminescence

Answer 15

chemiluminescence in a living organism

Question 16

which luminous source is chemiluminescence in a living organism

Answer 16

bioluminescence

Question 17

what is triboluminescence

Answer 17

light produced from friction between crystals

Question 18

which luminous source is light produced from friction between crystals

Answer 18

triboluminescence

Question 19

what is light-emitting diode (LED)

Answer 19

electronic device that produces light when electric current flows through it