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- See also changes related to Frequency, or pages that link to Frequency or to this page or whose text .
- Acoustic energy : Energy propagated as pressure waves, through elastic media such as air or water. Hearing is the detection of acoustic energy within the frequency range of the animal detecting the energy
- Electromagnetic spectrum : The range of electromagnetic waves covering all frequencies and wavelengths.
- Electromagnetic wave : A change, periodic in space and time, of an electric field E(r,t) and a magnetic field B(r,t); a stream of electromagnetic waves, referred to as electromagnetic radiation, can be seen as a stream of massless elementary particles, named photons.
- Periodic processes : Add brief definition or description
- Vibrational spectrum : The set of frequencies exhibited by regular, periodic motions of the parts of a mechanical system relative to one another that persist once excited without requiring an external driving agency.
- Wavelength : For a repeating phenomenon such as a radio signal with a given frequency, the wavelength is the length, in meters, of a single repetition
- Microwave : Add brief definition or description
- Radar : (acronym for "radio detection and ranging") A technique used for detecting and tracking targets, navigation, imagery, and special applications.
- Radio : Transmission and reception of information, which can be voice, data or imagery over electromagnetic radiation in free space (i.e., wireless). The information is modulated onto a carrier wave
- ITU frequency bands : A terminological scheme by the International Telecommunications Union to broadly classify electromagnetic frequencies used for radio and radar.
- IEEE frequency bands : A terminological scheme by the Institute for Electrical and Electronic Engineers to broadly classify electromagnetic frequencies used for radio and radar.
- EU-NATO-US frequency bands : A terminological scheme by the European Union, the NATO and the U.S. military to broadly classify electromagnetic frequencies used for radio and radar.