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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.
For the sound wave we use Hertz as the unit of measurement where 1 Hertz = 1 vibration/second. Conceptually whenever a wave passes the medium it makes the first particle to which it comes in contact, vibrate. Then this particle vibrates the nearby particle at the same frequency. This is how energy is propagated.he frequency is the quantity obtained when we divide velocity of the wave by its wavelength. f = $\frac{1}{T}$ where T = time period. The figure depicts the different types of waves as classified according to their frequencies.