What is Light What Is Light Energy Energy

Energy…. üUsually needs a medium for transmission. üEx. Heat transfers by convection or conduction.

Light Energy…. . üTravels through the vacuum of outer space…. . üTransferred by radiation

Properties of Light üTravels in straight lines. üTravels VERY fast. - travel at a

Electromagnetic Waves An electromagnetic wave is a wave of energy that moves through space

Different electromagnetic waves have different lengths which give them different amounts of energy

Electromagnetic Spectrum üGamma rays üX-rays üUltraviolet light üVisible light üInfrared light üMicrowaves üRadio waves

But we don’t see radio waves and x-rays…. .

Our ears can not hear some high sound frequencies that dogs can. Similarly our

Visible Light! üAny electromagnetic wave that the human eye can detect. üCalled the Visible

- white light breaks into the colours of a rainbow when it passes through

Similarly…. Ø A rainbow appears in the sky from the sun’s rays.

So…. when light from the sun is broken down, its’ spectrum looks like The

When light from some sources is broken down, it’s Spectrum looks like a series

The Visible Light Spectrum is a very small part of a much larger spectrum

How Do You Remember the Colours? ØAll the colours spell the name Roy G

Words to remember the Electromagnetic Spectrum from Long to Short Wavelength Radio Waves Microwaves

What is BLACK Light? ØA lamp that emits electromagnetic radiation almost exclusively in the

Playing with Light! üRay box ü 2 prisms üDraw what you see under the

Vocabulary! Medium, Convection, Conduction Radiation Electromagnetic Wave Electromagnetic Spectrum Visible Light Prism

Newton noted that the individual coloured lines could not be separated further. These lines

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What is Light?

What Is Light? Energy!

Energy…. üUsually needs a medium for transmission. üEx. Heat transfers by convection or conduction.

Light Energy…. . üTravels through the vacuum of outer space…. . üTransferred by radiation in the form of an electromagnetic wave

Properties of Light üTravels in straight lines. üTravels VERY fast. - travel at a speed of 3. 00 X 108 m/s

Electromagnetic Waves An electromagnetic wave is a wave of energy that moves through space

Different electromagnetic waves have different lengths which give them different amounts of energy

Electromagnetic Spectrum

Electromagnetic Spectrum üGamma rays üX-rays üUltraviolet light üVisible light üInfrared light üMicrowaves üRadio waves (pg. 466)

But we don’t see radio waves and x-rays…. .

Our ears can not hear some high sound frequencies that dogs can. Similarly our eyes can not “see” some of the wavelengths of light.

Visible Light! üAny electromagnetic wave that the human eye can detect. üCalled the Visible Spectrum.

- white light breaks into the colours of a rainbow when it passes through a prism. - white light is made of all the colours of the visible spectrum

Similarly…. Ø A rainbow appears in the sky from the sun’s rays.

So…. when light from the sun is broken down, its’ spectrum looks like The sun’s light is therefore White Light.

When light from some sources is broken down, it’s Spectrum looks like a series of lines.

The Visible Light Spectrum is a very small part of a much larger spectrum called the Electromagnetic Spectrum

How Do You Remember the Colours? ØAll the colours spell the name Roy G Biv (but that’s boring!)

Words to remember the Electromagnetic Spectrum from Long to Short Wavelength Radio Waves Microwaves Infra Red Visible Spectrum Ultra Violet X-Rays Gamma Rays Raul's Mother Is Visiting Uncle Xavier's Garden Rabbits Mate In Very Unusual e. Xpensive Gardens Raging Martians Invade Roy G. Biv. Using X-rays & Gamma Rays

Las Vegas Light Show

What is BLACK Light? ØA lamp that emits electromagnetic radiation almost exclusively in the soft near ultraviolet range. ØOnly a very small fraction of visible radiation is emitted, and it is seen as violet/blue light!

Playing with Light! üRay box ü 2 prisms üDraw what you see under the light rays!

Vocabulary! Medium, Convection, Conduction Radiation Electromagnetic Wave Electromagnetic Spectrum Visible Light Prism

Homework! Pg. 469 # 2 - 9

Newton noted that the individual coloured lines could not be separated further. These lines are pure colours and are identified by a frequency and wavelength number.