What is light?? - PowerPoint Presentation

What is light??
What is light??

What is light?? - Description


Light is a form of energy that is created from a different form of energy There are two types Incandescence Light from heat or high temperature Luminescence Light from electron giving off energy ID: 314641 Download Presentation

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Presentation on theme: "What is light??"— Presentation transcript


Slide1

What is light??Slide2

Light is a

form

of energy that is created from a different form of energy

There are two types

Incandescence

- Light from heat or high temperature

Luminescence

–Light from electron giving off energy

https://www.youtube.com/watch?v=

YnMP1Uj2nz0

What are the source of light you know of and which one do you think it fits into?Slide3

Luminescence Sources

Chemiluminescence

- Light given off by a chemical reaction

Bioluminescence

- Light given off by a chemical reaction within an organismSlide4

Luminescence Sources

Electroluminescence

- Luminescence cause by electric

currents

https://www.youtube.com/watch?v=

BH9LI973H8w

Cathodoluminescence- Electroluminescence cause by electron beamshttps://www.youtube.com/watch?v=qp6tNaUvfNISlide5

Luminescence Sources

Fluorescence

- Luminescence where energy is given off by the movement of

electrons to non-excited state.

Electrons are found in atoms. They can get excited and take in energy. When they release that energy it comes off as

light photons

. Phosphorescence- is a delayed light that is created because electrons are stuck in a high energy state and has not given off the energy as light yet.

https://www.youtube.com/watch?v=

kLEHNYWQl68Slide6

What types of light bulbs do you have in your house?

How often do the light bulbs need changing?

What are some factors that you think about when buying light bulbs? Slide7

Which bulb would you choose?

Incandescent

L.E.D

C.F.L.

Lumens

825

800

900

Wattage

60

11

14

Cost of bulb

6.00 for 12

11.98

4.98 for 2

Life Span

1,000

25,000

10,000

Cost of running the light bulb

over

its life span

$7.872

$36.08

$18.368Slide8

Which bulb would you choose?

Incandescent

L.E.D

C.F.L

Does

it contain mercury

no

no

yes

Can you recycle it?

no

yes

no

Is

it dimmable

yes

yes

noSlide9

http://energy.gov/public-services/homes/saving-electricity/

lighting

http://www.huffingtonpost.com/2014/03/30/daan-roosegaarde_n_5044578.

htmlSlide10

Exit slip

Which light bulb are you likely to buy now that we have compared some? What factors are the most important to you in a light bulb?

Explain in your own words what is the difference between Luminescence and Incandescence light sources.

What is bioluminescence?

Shom More....