what is light?. what is light? energy! energy…. usually needs a medium for transmission. ex. heat...
TRANSCRIPT
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What is Light?
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What Is Light?
Energy!
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Energy….
Usually needs a medium for transmission.Ex. Heat transfers by
convection or conduction.
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Light Energy…..Travels through the vacuum of outer space…..
Transferred by radiation in the form of an electromagnetic wave
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Properties of LightTravels in straight lines.Travels VERY fast.- travel at a speed of
3.00 X 108 m/s
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Electromagnetic WavesAn electromagnetic wave is a wave of energy that moves through space
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Different electromagnetic waves have different lengths which give them different amounts of energy
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Electromagnetic Spectrum
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Electromagnetic SpectrumGamma raysX-raysUltraviolet lightVisible lightInfrared lightMicrowavesRadio waves
(pg. 466)
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But we don’t see radio waves and x-rays…..
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Our ears can not hear some high sound frequencies that dogs can.
Similarly our eyes can not “see” some of the wavelengths
of light.
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Visible Light!
Any electromagnetic wave that the human eye can detect.
Called the Visible Spectrum.
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- 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
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Similarly…. A rainbow appears in the sky from the sun’s rays.
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So….when light from the sun is broken down, its’ spectrum looks like
The sun’s light is therefore
White Light.
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When light from some sources is broken down, it’s Spectrum looks like a series of lines.
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The Visible Light Spectrum is a very small part of a much larger spectrum called the Electromagnetic Spectrum
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How Do You Remember the Colours?
All the colours spell the name
Roy G Biv
(but that’s boring!)
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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 eXpensive
Gardens
Raging Martians Invade Roy G. Biv.
Using X-rays & Gamma
Rays
Words to remember the Electromagnetic
Spectrum from Long to Short Wavelength
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Las Vegas Light Show
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What is BLACK Light?
A lamp that emits electromagnetic radiation almost exclusively in the soft near ultraviolet range.
Only a very small fraction of visible radiation is emitted, and it is seen as violet/blue light!
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Playing with Light!Ray box2 prismsDraw what you see under the light rays!
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Vocabulary!
Medium, Convection, ConductionRadiation
Electromagnetic WaveElectromagnetic Spectrum
Visible LightPrism
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Homework!
Pg. 469 # 2 - 9
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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.