The frequency is period the velocity of an electrical wave ie the number of oscillations per second that the wave does. Frequency is measured in Hertz (Hz) which is a unit which is derived from the SI system and corresponds to one cycle per second.
The time that passes during a period that is a wavelength.
angular frequency may be called a rotation speed and is a measure of how much an object rotates around its center of rotation. Angular velocity is measured in the SI unit radians per second (rad/s). Radian is a rewriting for degrees that facilitate mathematical calculations.
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