The wavelength is the distance travel by a wave in one cycle. The are two easy ways to measure them. One is by the distance from one crest, the bottom of the wave, to another crest, or just by the distance from two identical points on the wave. The symbol for wavelength is
; it is the Greek letter called lambda. What is the importance of the length of a wave? How do we identify all these waves in the whole Electromagnetic Spectrum? All eight different waves in the Spectrum differ from each other by their wavelengths. For example the wavelength of visible light come in all different lengths depending on the color.
| Color | | Wavelength |
|---|
| Red | | .68 microns |
| Orange | | .63 microns |
| Yellow | | .58 microns |
| Green | | .53 microns |
| Blue | | .48 microns |
| Violet | | .43 microns |
Here is a chart of the wavelengths in the Spectrum:
| Gamma Rays |
<
0.000000000001 m |
|
<
1 pm |
| X-Rays |
0.000000001
- 0.000000000001 m |
|
1
nm
- 1 pm |
| Ultra Violet |
0.0000004
- 0.000000001 m |
|
400
nm -1 nm |
| Visible |
0.00000075
- 0.00000038 m |
|
750
nm
- 380 nm |
| Infrared |
0.000025
- 0.0000025 m |
|
25
 m
- 2.5 m |
| Microwaves |
0.001
- 0.000025 m |
|
1
mm
- 25 m |
| Radiowaves |
>
0.001 m |
|
>
1 mm |
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