Is the Color Spectrum Just a Fraction of the Electromagnetic Spectrum?

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is the color spectrum simply a small segment of the electromagnetic spectrum?
 
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Yes. Examples of "invisible" light include ultraviolet, microwaves, and radio waves.
 
http://www.glenbrook.k12.il.us/gbssci/phys/Class/light/u12l2a.html
 
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Thread 'A cylinder connected to a hanging mass'

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