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The horizontal scale represents frequency ranges from 0.1 hertz to 1 exahertz. The frequency range from 0.1 hertz to 1 megahertz is labeled, induces low current at extremely low frequency. The frequency range at 1 megahertz is labeled, radio. The frequency range from 1 megahertz to 1 terahertz is labeled, induces high current at the microwave. The frequency range from 1 terahertz to 1 exahertz is labeled, excites electrons at infrared, visible light, and ultraviolet. The frequency range above 1 exahertz is labeled, damages D N A at x-rays and gamma rays. The extremely low frequency, radio, microwave, infrared, and visible light are non-ionizing radiations whereas, ultraviolet, x-ray, and gamma rays are ionizing radiations.