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Frequency is a measurement of how often a recurring event such as a wave occurs in a measured amount of time. One completion of the repeating pattern is called a cycle. Only moving waves which vary their positions with respect to time possess frequency. Frequency is one way to define how fast a wave moves.
The quantities that are used for waves include Frequency, amplitude, wavelength, and wave speed. The amplitude of wave is determined by measuring the graphical representation of wave. It is distance of wave from its centre line to its still position.emi amplitude = +V or-V. Root Mean Square Amplitude: It is also called RMS is the root of the mean of the squared value of the maximum distance from the baseline of the wave. If we consider the sine wave then we have a formula which related the peak to peak amplitude to the rms amplitude of the sine wave.