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3. How does this stuff work?
Chart 1
Images from 
3. How does this stuff work?
Chart 2
Images from 
3. How does this stuff work?
The electromagnetic spectrum represents the full range of electric, magnetic and visible radiation in the universe. Waves in the spectrum vary in size, frequency and energy, and they are classified by their wavelength. Waves of similar lengths are categorized into bands. The Federal Communications Commission allocates licenses for use of specific radio-wave frequencies. Chart 3