FIGURE 3.1Visible Light and the Electromagnetic SpectrumOnly a small part of the electromagnetic spectrum can be detected by the human visual system. Visible light wavelengths range from approximately 400 to 700 nanometers.
Radioactive symbol, Thinkstock; X-Ray hand, AJ Photo/Science Source; Marines, Lance Cpl. Tucker S. Wolf. U.S. Marine Corps; Hand holding phone, © Rob Bartee/Alamy; Radio tower, TERADAT SANTIVIVUT/Getty Images
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