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Copyright © 2011 by Darrell Causey, Jr.
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Understanding Light as a Wave
Copyright © 2011 by Darrell Causey, Jr.
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What is Light? Light is Electromagnetic Radiation or EMR. AM and FM
Microwaves Infrared Visible Ultraviolet X-rays Copyright © 2011 by Darrell Causey, Jr.
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Light … “corpuscles” Sir Isaac Newton
Suggested light was a stream of particles. “corpuscles” Copyright © 2011 by Darrell Causey, Jr.
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Light … Christiaan Huygens Suggested light was a wave.
Copyright © 2011 by Darrell Causey, Jr.
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Light as a Wave James Clerk Maxwell
Developed 4 equations that showed light to be a wave. Copyright © 2011 by Darrell Causey, Jr.
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Copyright © 2011 by Darrell Causey, Jr.
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Electromagnetic Wave Is composed of an electric wave and a magnetic wave traveling at right angles to each other. Copyright © 2011 by Darrell Causey, Jr.
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Electromagnetic Wave Doesn’t need to travel through a medium (substance). It can pass through a vacuum. Copyright © 2011 by Darrell Causey, Jr.
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Speed of Light 3.00 x 108 meters/sec
Copyright © 2011 by Darrell Causey, Jr.
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Maximum and Minimum crest trough
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Amplitude ½ the distance between the maxima and minima amplitude
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Wavelength (λ) wavelength Copyright © 2011 by Darrell Causey, Jr.
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Frequency (ν) The number of cycles that pass through a point in a certain amount of time. cycle Copyright © 2011 by Darrell Causey, Jr.
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Hertz (Hz) One cycle per second (s-1)
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Frequency vs. Wavelength
Frequency and wavelength are inversely proportional. Copyright © 2011 by Darrell Causey, Jr.
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ν } Frequency vs. Wavelength λ short HIGH
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ν Frequency vs. Wavelength λ LONG low
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Frequency vs. Wavelength
Frequency times wavelength is the speed of light. Copyright © 2011 by Darrell Causey, Jr.
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Questions? Copyright © 2011 by Darrell Causey, Jr.
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Check out … www.mrcausey.com For more information.
Copyright © 2011 by Darrell Causey, Jr.
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