There is a very limited amount of radio spectrum, the low end is sound and the top end is light waves (sound, radio and light waves are basically the same thing only different frequencies.)
Just to clarify, light and Radio waves are both part of the electromagnetic spectrum. So are microwaves and X-rays. Sound is not.
One end of the spectrum is represented by low frequency radio waves with wavelengths around 10^3 meters. The other end is gamma rays with wavelengths around 10^-12 meters. Visible light wavelengths are between .4 and .7x10^-6 (400 to 700 nanometers).
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