refers to the volume of full wavelengths that move by a offered place in Place every 2nd; the SI unit for frequency is Hertz (Hz)‍ , that is akin to “for every seconds” (‍ penned as 1s‍  or s−one)‍ .In the fifth century BC, Empedocles postulated that every little thing was composed of 4 features; hearth, air, earth and drinking wa