Electrical and acoustic transmissions oscillate and propagate at various time rates, depending on the sources which generate the transmissions, and the media in which the transmissions occur.
Electromagnetic waves contain photons or electrons which oscillate at frequencies ranging from 16 cycles per second for long wavelengths, to 10 to-the-minus 24 cycles per second for short waves.
Electromagnetic waves propagate at the average speed of light, or about 186,000 miles per second.
Electromagnetic waves include power and telephone transmissions, radio and television signals, microwaves, infrared, visible light, and ultraviolet waves, as well as x-rays, and gamma rays.
Acoustic waves are sound waves which are transmitted in the earth’s atmosphere, hydrosphere, biosphere, and lithosphere, as well as on or near other planetary bodies, in the solar wind, in stars and galaxies, and in interstellar dust clouds.
Acoustic waves consist of molecular substances which oscillate at frequencies ranging from a single cycle within a period of several days or months, to billions of cycles per second.
Acoustic waves propagate at speeds ranging from subsonic speeds of several feet per second, to hypersonic speeds which approach the speed of light.
The average speed of sound at sea level at 15 degrees centigrade is about 1100 feet per second, or 760 miles per hour.
Electrochemical waves constitute a special state of wave motion in which electrical wave pulses are transmitted throughout the central nervous system of living organisms, including the brain.
Electrochemical impulses fluctuate at frequencies ranging from 1 or fewer cycles per second, to several hundred cycles per second, and propagate at subsonic speeds ranging from 1 to 100 meters per second.