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Why are radio waves, visible light, and X-rays all electromagnetic waves?

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Learn about magnetic fields and the levels of particles, atoms, crystals, and domains — magnet Magnetic fields and the levels of magnetism of particles, atoms, crystals, and domains.

Radio waves, visible light, and X-rays are all classified as electromagnetic radiation because they are fundamentally the same physical phenomenon: waves consisting of oscillating electric fields and magnetic fields that propagate through space at the speed of light.12

These waves are generated by the motion of electric charges. According to Maxwell’s equations, a time-varying electric field produces a magnetic field, and a time-varying magnetic field produces an electric field. This mutual induction allows the fields to sustain each other as they travel through a vacuum.342

While they share this underlying nature, they are categorized into different regions of the electromagnetic spectrum based on their frequency and wavelength. The differences in these values—which span a vast range—result in distinct behaviors regarding how the waves are emitted, transmitted, and absorbed by matter. Consequently, they are given different names, such as radio waves or X-rays, depending on their specific range and practical applications.51