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What is the Frequency?

29 February 2020

The subject of this week's blog post at musiconline is frequency, one of the greatest inventions of Heinrich Rudolf Hertz, the German physicist who has had many successes during his short life.

Before we explain the term of frequency, let's look at the point of exit.


Electromagnetic is a French physics term used in electrical descriptions. Electromagnetism is the physical force that causes the interaction between electrically charged particles.

British physicist James Maxwell discovered electromagnetic waves, also known as radio waves, in 1865. Maxwell developed the thesis that sounds travel far distances from the air at a speed close to the speed of light.

German scientist Hertz also proved Maxwell's thesis with his experiments. In his experiments over the passage of electric current through metal plates, Hertz proved that electromagnetic currents are in a wavy structure rather than particles, capable of reflection, refraction and interference, and as a result discovered frequency.

Frequency describes the number of waves (vibrations) that pass through a fixed place in a given time. So to measure the frequency of something, you look at how many times it repeats itself in a given time frame. The time period that passes for a repeat of the movement is called a period. So if the time it takes for a wave to pass is 1/2 second, then the frequency is 2 per second.

The frequency was named in honor of the German physicist Heinrich Rudolf Hertz in the 19th century. Frequency is measured in hertz (Hz) units.

Alternating Current

We call the voltage alternative to the voltage that changes direction and intensity according to time.
There is no frequency in direct current, the frequency is in alternating current.

Let's look at the subject on the graph;

We call this curve as cycle which is from zero point to positive max and again to zero point then to negative max and then again to zero point.

Frequency (f) is the number of times that the number of cymbals that occur in a second is called frequency.

Frequency 2

The time taken for the formation of a cycle is also called Period (T). The unit of period is seconds (sec).

The period is mathematically the opposite of the frequency.

Frequency 3

The frequency is measured by the frequency meter.

Types Of Frequencies

    • Audio Frequency
      Audio has fast-changing frequency and wavelength characteristics. When it passes through the air, the pressure changes periodically. The number of these pressure changes per second is called the sound frequency. Audio frequency is also measured in units of Hertz (Hz) but expressed in decibels (db). Frequency and audio are directly proportional, the higher the frequency, the higher the audio is perceived.

      People can only hear vibrations in the 20-20.00 Hz range.

    • Radio Frequency
      The radio frequency, which is also used in the sense of high frequency, means the carrier signal, which is designed as an information signal in broadcasting. The radio signal is indicated by the abbreviation RF. The information carried is symbolized by AF, and the image is symbolized by VF.
    • Light Frequency
      The human eye senses the frequency of colors and the brain interprets it as color. The frequency of light refers to the color of light. Low frequency light waves are red, high frequency light waves are blue. The light that our eyes perceive as red has a frequency of about 420 Terahertz (THz). This means that electromagnetic fields travel back and forth 420 trillion times per second. Radio waves, microwaves, infrared, ultraviolet, x-rays and gamma rays are wavelengths that our eyes cannot detect.


  • In this week's post, we tried to summarize and convey the frequency and variations. We recommend you to take a look at another blog post that we touch upon the frequencies produced by sounds.If you like our post, you can share it with the buttons below and subscribe to our weekly newsletter to be informed about new blog posts of musiconline.
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