LIGHTLIGHT

The 8The 8thth Wonder of the Wonder of the WorldWorld

Light is a Light is a FORM OF ENERGYFORM OF ENERGY

called called ELECTROMAGNETIC ELECTROMAGNETIC

RADIATIONRADIATION

ElectromagneticElectromagnetic RadiationRadiation comes in many forms…comes in many forms…

Radio wavesRadio waves X-raysX-rays MicrowavesMicrowaves

LIGHTLIGHT is the part that we can see is the part that we can see

(like(like ththee cocolors lors in ain a rainbow)rainbow)

Light is the fastest moving Light is the fastest moving form of energy.form of energy.

The speed of light is about 186,000 miles per second.

Light from the sun takes about 8 minutes to reach the earth.

Light will travel in a perfectly straight line until something blocks orLight will travel in a perfectly straight line until something blocks or

LightLight seems to be seems to be colorlesscolorless, but , but it is really a mixture of colors.it is really a mixture of colors.

These colors are absorbed differently by various objects. An orange lets orange bounce off it and soaks up the other colors so that the orange looks orange.

Things like:Things like:

Cameras Lasers Telescopes

CD PlayersYour Eyes

And many, many more things…

Depend upon the use of light

Light can be controlled in three basic Light can be controlled in three basic ways…ways…

It can be blocked.It can be blocked.

It can be reflected.It can be reflected.

It can be bent.It can be bent.

A Prism will split white light into all A Prism will split white light into all the colors of the rainbow.the colors of the rainbow.

Sunlight passing through raindrops

will also divide the light into its component colors.

The band of rainbow The band of rainbow colors is called the colors is called the spectrum of light.spectrum of light.

Red

Orange

Yellow

Green

Blue

Indigo

Violet

LaserLaser

A laser is a special source of light of only one pure color (or wavelength.) A laser can be sharply focused without spreading out very much. This beam of light contains enough energy to cut through thick metal or make tiny, precise incisions.

Among other things, lasers are used to read CD’s and create holograms.

Light is very useful to us.Light is very useful to us.

It enables us to see. It moves fast andcan carry information. It is used in lasers,cameras, and even solar cells.

In the past, present, and future…

Light plays an enormous part in our lives.

Explore the 8th Wonder of the Explore the 8th Wonder of the World at these wonderful web World at these wonderful web sights:sights:

Howstuffworks "How Light Works"

UCC - School of Education - Materials - Light

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