Orange, yellow, green, and blue each exhibit unique frequencies and consequently wavelengths. While we can perceive these electromagnetic waves in their corresponding colors, we cannot see the rest of the electromagnetic spectrum. Most of the electromagnetic spectrum is invisible, and exhibits frequencies that traverse its entire breadth. Exhibiting the highest frequencies are gamma rays, x-rays and ultraviolet light. Infrared radiation, microwaves, and radio waves occupy the lower frequencies of the spectrum.
Visible light falls within a very narrow range in between.
So radio waves, such as those that FM radio stations broadcast, are simply electromagnetic waves with a much lower frequency and longer wavelength than visible light. The millimeter radio waves, also called microwaves , possess a slightly higher frequency and shorter wavelength than the FM radio waves. The Cosmic Barcode Notice the three highlighted regions in the picture of the electromagnetic spectrum above. The leftmost region shows which frequencies the typical FM broadcast stations use. The middle highlighted region indicates which frequencies the BIMA array detects.