Electromagnetic waves form from the vibrations of electric and magnetic fields. Unlike mechanical waves, electromagnetic waves do not need a medium to propagate, allowing them to travel through air, solids and even outer... More » Science Physics Magnetism

Electromagnetic waves carry electromagnetic energy, also known as electromagnetic radiation, through matter, empty space, momentum and angular momentum. Depending on their frequency and wavelength, electromagnetic waves ... More » Science Physics Optics & Waves

Heinrich Rudolph Hertz, a German physicist, discovered the existence of electromagnetic waves in 1887. This was a result of his expansion of James Clerk Maxwell's mathematical "Electromagnetic Theory of Light," published... More » History Inventions
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The spectrum of electromagnetic radiation is comprised of waves or particles that carry different amounts of energy. The visible spectrum is what humans and most animals see. The least energetic range of electromagnetic ... More » Science Physics Magnetism

Energy is transferred in electromagnetic waves by vibrations in electric and magnetic fields. The vibration of air particles is energy transfer in sound waves, while the transfer of energy in water waves is the oscillati... More » Science Physics Optics & Waves

Common electromagnetic devices include tape recorders, loudspeakers, maglev trains and electric motors. Other common devices are electromagnetic locks, doorbells and magnets used to pick up metal scrap. More » Science Physics Magnetism

Electromagnetic radiation is energy that comes from a wide variety of sources. It comes in a broad spectrum of wavelengths, frequencies and energies. Scientists break the electromagnetic spectrum into several different c... More » Science Physics Magnetism