By Fatskills Exam Guides Team — the exam nerds behind 28,500+ quizzes and 2.1M practice questions across 500+ global exams.
Electromagnetic Spectrum The electromagnetic spectrum is the range of all wavelengths and frequencies of known electromagnetic waves. Visible light occupies only a small portion of the electromagnetic spectrum. Some of the common classifications of electromagnetic waves are listed in the table below with their approximate frequency ranges. Classification - Freq. (Hz) Gamma Rays - ~1019 X-Rays - ~1017 – 1018 Ultraviolet - ~1015 – 1016 Visible Light - ~1014 Infra-red - ~1011 – 1014 Microwaves - ~1010 – 1011 Radio/TV - ~106 – 109 Electromagnetic waves travel at the speed of light, c = 3 x 108 m/s. To find the wavelength of any electromagnetic wave, simply divide c by the frequency. Visible light occupies a range of wavelengths from approximately 380 nm (violet) to 740 nm (red). The full spectrum of color can be found between these two wavelengths.
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