# What is frequency?

## What Does frequency Mean

It is called often to less or more repetition of an event . For example: "In this city it rains too often" , "The protagonist often mistakes the letter" .

The term comes from the Latin frequentĭa and also makes it possible to refer to the number of times a periodic process is repeated per unit of time. The International System notes that frequencies are measured in Hertz (Hz) , a unit named after the German physicist Heinrich Rudolf Hertz . One Hz is an event that repeats once per second; therefore, the unit is also known as the cycle per second (cps) .
Other units linked to frequencies are revolutions per minute (rpm) , radians per second (rad / s), and strokes per minute (bpm) . The bpm is used to measure the heartbeat or the tempo of music .

In the field of radio and television, the term frequency is widely used, since it establishes the bands in which the different stations, of both mediums, broadcast. In other words, they are the bands they have assigned and that if we look for them we can enjoy the programs of a specific radio station or a channel on the small screen in question.
In telecommunications , the frequency band is the interval of frequencies between two established limits that determine its application. It should be noted that the frequency maintains an inverse relationship with the wavelength : the higher the frequency, the shorter the length and vice versa.
The audio covers all waves whose frequencies are between 20 and 20,000 Hz, which means that are audible to the human ear. The infrasound are below the audio frequencies, whereas ultrasound are above; therefore, they are inaudible to humans.
In the same way, it is also worth noting the fact that in the field of cinema there is a film entitled “Frequency”. It was in the year 2000 when it saw the light, which is directed by Gregory Hoblit and starring both Dennis Quaid and Jim Caviezel, which takes as its starting point the development of a unique natural phenomenon within the Northern Lights.
It is a fact that John can contact his father through an amateur radio station. The unique thing about the matter is that this connection is made by breaking all the barriers of time because John lives in 1999 and manages to speak with his father while he is living in the 60s and shortly before he dies in a work accident.
In addition to all the above, we cannot ignore the fact that the term frequency is used in various countries as part of already colloquially established expressions. Thus, for example, in Cuba there is the adverbial phrase "transmit on different frequencies" that is used when you want to make it clear that a person has an opinion or idea different from ours.

For statistics , frequency is the number of elements within an interval with a given distribution.

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