Smythe, William R. Formerly, Department of Physics, California Institute of Technology, Pasadena, California.
- Detection of radiation
- Free-space waves
- Plane waves
- Spherical waves
- Damped waves
- Wave impedance
- Electric dipole
- Links to Primary Literature
- Additional Readings
Energy transmitted through space or through a material medium in the form of electromagnetic waves. The term can also refer to the emission and propagation of such energy. Whenever an electric charge oscillates or is accelerated, a disturbance characterized by the existence of electric and magnetic fields propagates outward from it. This disturbance is called an electromagnetic wave. The frequency range of such waves is tremendous, as is shown by the electromagnetic spectrum in the table. The sources given are typical, but not mutually exclusive, as is shown by the fact that the atomic interstellar hydrogen radiation whose wavelength is 0.210614 m falls in the radar region. The other monochromatic radiation listed is that from positron-electron annihilation whose wavelength is 2.42626 × 10−12 m.
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