types of light

Question 1

whats the difference between incandescence and luminescence

Answer 1

incandescence the emission of light from an object due to high temperatures, while luminescence is the emission of light without the involvement of heat

Question 2

what is electric discharge

Answer 2

the flow of electricity through a medium such as gas
-> ie sodium vapour bulbs

Question 3

what are the 4 types of luminescence?

Answer 3

1) fluorescence
2) bioluminescence
3) phosphorescence
4) chemiluminescence

Question 4

what is fluorescence?

Answer 4

an object absorbing UV light to immediately release the energy as visible light!

note: 5 times more efficient than incandescent bulbs, because incandescent bulbs loose 95% of there energy on heat.

Question 5

an example of fluorescence?

Answer 5

sodium and mercury bulbs

Question 6

what is phosphorescence?

Answer 6

light that is emitted due to the expose of a source of UV. continues to emit after the absence of UV

-> ie: glow in the dark

Question 7

what is chemiluminescence?

Answer 7

production of light as a result of a chemical reaction

-> glow sticks

Question 8

what is bioluminescence?

Answer 8

production of light within a living organism as a result of a chemical reaction

->firefly

Question 9

is the sun an incandescent light source?

Answer 9

yes, due to the fac that fusion reactions take place at the sun and create an abduance of heat. as well, solar energy is another form of heat energy, which produces light!