COLOR  PHENOMENA Page: 03. 01
Introduction Ingredients Spectra Attributes The Human Eye Color Mixing General Terms
Color Spaces How to measure Color Scales Color Effects After Images Contents

Spectra

ELECTROMAGNETIC SPECTRUM on page 03.00
VISIBLE SPECTRUM on this page
RAINBOW on page 03.02
PRISM on page 03.03

SOLAR SPECTRUM on page 03.04

INTERFERENCE on page 03.05

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VISIBLE  SPECTRUM

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Source of this Spectrum: www.datacolor.com      "Color by the Numbers 3rd edition"  

 


The Visible Spectrum arranged in the order Red, Orange, Yellow, Green, Blue and Violet according to the different wavelengths
of Light with a seventh Color ( Indigo ) sometimes specified, between Blue and Violet.


The Light in the region with the shortest wavelength is seen as Violet. The Light in the region of the longest wavelength is seen as Red.
The light region which The Human Eye can see is called The Visible Light Region or The Visible Spectrum.


If we move beyond The Visible Light Region toward longer wavelengths, we enter the infrared region and if we move toward shorter wavelengths, we enter the ultraviolet region.
Both of these regions cannot be seen by The Human Eye.

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Color tone (Hue) approximately

Wavelength

Frequency  

Energy

    in "nm" in "m"  in "Hz" in "eV"
infrared invisible        
RED (limit)   625 - 700 6.25 x 10-7 - 7.00 x 10-7 ± 4.29 x 1014 ± 1.77
ORANGE   590 - 625 5.90 x 10-7 - 6.25 x 10-7 ± 5.00 x 1014 ± 2.06
YELLOW   565 -590 5.65 x 10-7 - 5.90 x 10-7 ± 5.16 x 1014 ± 2.14
GREEN   520 - 565 5.20 x 10-7 - 5.65 x 10-7 ± 5.45 x 1014 ± 2.25
CYAN   500 - 520 5.00 x 10-7 - 5.20 x 10-7 ± 5.99 x 1014 ± 2.48
BLUE   440 - 500 4.40 x 10-7 - 5.00 x 10-7 ± 6.66 x 1014 ± 2.75
INDIGO   420 - 440 4.20 x 10-7 - 4.40 x 10-7 ± 7.08 x 1014 ± 2.93
VIOLET (limit)   400 - 420 4.00 x 10-7 - 4.20 x 10-7 ± 7.50 x 1014 ± 3.10
ultraviolet

invisible

       
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EXPLANATION

Light has wave characteristics;
wavelength is the 
peak to peak distance 
of two adjacent waves.


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"Wavelength" ( symbol is λ ) is equal to the "Velocity of light" divided by the frequency. ( λ = 3 * 108/ f )
The wavelength of Light is so small that it is conveniently expressed in nanometres ( nm ) which are equal to one-billionth of a meter. Wavelength as the distance, measured in the direction of propagation of a wave, between two successive points in the wave that are characterized by the same phase of oscillation.
"nm" ( nanometre ) A unit of measure often used when discussing wavelengths of Light. 
µm (micrometer) is also used sometimes.
"Frequency"   ( symbol is f ) is equal to the "Velocity of light" divided by the wavelength. ( f = 3 * 108/λ )
"Velocity of light" ( symbol is c ) is approximately 300,000 kilometres per second ( about 186,000 miles per second ) 
( c = f * λ ) ( c as m/s ) ( f as "
Hz" ) and ( λ as m )
"Hz" Frequency is expressed in Hertz ( "Hz" ); a frequency of 1 Hz means that there is 1 cycle or oscillation per second.


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Hertz, Heinrich, Rudolf 
 (German physicist) 
b-1857-02-22 
Hamburg Germany 
d-1894-01-01
 Bonn Germany

"Energy"

The light has specific frequencies associated with the energy quanta. To remove an electron from an atom requires several electron volts, depending on the atom. There are 2.26 x 1025 eV in one kilowatt-hour. Visible light has a quantum energy of approximately 2 eV.

"eV"

Energy at the atomic level is commonly expressed in electron volts ( eV )

Length Conversion

1 nm = 10-9 m = 10-6 mm = 10-3 µm
1 µm = 10-6 m = 10-3 mm = 1000 nm

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 Last update
2010-06-05