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All waves of the electromagnetic spectrum have the same speeds but different frequencies and wavelengths. So, wavelength is important for defining the regions in the electromagnetic spectrum (frequency would have been equally useful)
Frequency or wave lengths (your choice), usually by "octaves" (i.e. a doubling of frequency).
Assuming you mean the regions of the electromagnetic spectrum then: From Low to High wavelength Radio Microwave Infra Red Visible Ultra Violet X-Ray Gamma Ray Bear in mind that these regions tend to merge into one another and are regionalised mainly for practical purposes. Go to the Related Links for more detail
The EM spectrum, is based upon the emission of photons at different wavelengths. Visible light is a small part of this spectrum. As all of the spectrum travels at the speed of light - C. The frequencies for different wavelenghts of photons will be different. The creation of these different parts of the spectrum are from different oscillations (http://en.wikipedia.org/wiki/Electromagnetic_spectrum#Rationale) For instance radio waves come from the oscillation of electrons in an antenna. Limitations on these oscillations cause the limitation in the spectrum, at one end there is radiowaves, limited by electron oscillation and the at the other side is gamma from the creation of particle antiparticle pairs.
Radio waves as low as 10kHz frequencies are used, and the radiowave spectrum gradually passes through the millimeter waves into the Infra Red, then the Visible and Ultra Violet regions, up into the X-ray and then the gamma ray regions, by which time, the wavelength is so short, that one may consider them as particles.
The two regions of the electromagnetic spectrum are best utilized by ground based astronomers are optical and radio.
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All waves of the electromagnetic spectrum have the same speeds but different frequencies and wavelengths. So, wavelength is important for defining the regions in the electromagnetic spectrum (frequency would have been equally useful)
orange red and violet blue
France
Canada
In the rainforest regions.
Frequency or wave lengths (your choice), usually by "octaves" (i.e. a doubling of frequency).
France
divergent plate boundaries
New England!
The part of the rainbow that you can see is. There's more to the rainbow than what you see ... outside the red end and outside the violet end. Those regions are composed of parts of the spectrum that are not visible.