# Definition of Frequency and the Formula for Calculating It

In everyday life you may have heard the term frequency. This term is taken from English ‘frequency’ which means a measure of the number or it can also mean the level of frequency. In physics, frequency is the number of vibrations that occur in 1 unit of time. In physics, frequency is closely related to sound or sound.

## Definition of Frequency

According to the Big Indonesian Dictionary (KBBI), the meaning of frequency is taken from the English word ‘Frequency’. This term is generally defined as the level of how often to do a job or a measure of the amount. The meaning of this term then varies depending on what context it is used in, but sticks with the keyword ‘quantity measure’.

In the disciplines of electronics and physics, the meaning of frequency is the number of vibrations / electric waves produced every one second. The frequency symbol in the discipline of physics is denoted by a lowercase f (f) with units of Hertz (Hz).

In general, the definition of frequency is a measure of the number of rounds per event in a predetermined time lag. In calculating this frequency we need to first determine the time interval, count the number of events, and also divide the count by the length of the existing time interval.

The term frequency is used in various fields. Not only in the fields of physics and electronics, but also in the context of medicine to the context of statistics. Therefore, the definition of frequency in each context can also be different.

## Frequency Formula

This frequency can be calculated using a special formula. The frequency formula used to calculate the frequency is f = 1/T, where f = frequency and T = time period in seconds (seconds). For more details, please see below:

### Formula for Calculating Frequency

f = 1/T

Where :
f = Frequency in Hertz (Hz)
T = Period in seconds (sec)

### Formula for Calculating Period

T = 1/f

Where :
Period (T) = time (t)
many waves (n)
and
Period (T) = wavelength (λ)
speed propagation (v)

## Frequency Measuring Instrument

In our opinion, there are 2 kinds of tools to measure the frequency of sound / sound. The tool is in the form of a software/windows application called Zelscope and hardware called a Frequency Counter.

Both of these sound wave measuring instruments have a high level of accuracy. It’s just that each runs on a different platform. Here’s the discussion.

### Frequency Counter

This frequency counter is a frequency measuring instrument that is equipped with an LCD screen to display the measurement results. This tool can accurately measure the frequency of repeated electronic signals.

One of the components of this tool is equipped with a program/digital logic to count the number of cycles during a certain time interval. Regarding the picture of the Frequency Counter, you can see above.

### Zelscope App

The second frequency measuring instrument is the Zelscope. Zelscope itself is an application/software that can convert a computer (PC) into a simple oscilloscope capable of recording, storing, and analyzing the spectrum of sound wave data.

This Zelscope application runs on the Windows platform. In principle, this application works like a simple oscilloscope so it is very easy to use without the need for the help of complicated equipment.

## Examples of Kinds of Frequency in the Field of Science

From several definitions of frequency in the Big Indonesian Dictionary (KBBI), Frequency is divided into three branches of science, namely frequency in physics and electronics, frequency in statistics, and frequency in physical science.

### Frequency in Physics and Electronics

The term frequency is most often used in the fields of physics and electronics. In physics, frequency is closely related to sound. Sound frequency describes the number of vibrations produced by a sound source in one unit of time or in one second.

While in electronics, frequency is related to waves. Wave frequency is defined as the number of electrical waves generated per unit of time (every one second). This frequency can be calculated using a certain formula like the Slovin formula.

In the context of sound, frequency indicates the size or number of vibrations. The sound itself is then divided into several types based on its frequency. There are types of infrasonic, ultrasonic and audiosonic sounds with a number of different frequencies.

Not all living things can hear every kind of sound. Each type of sound can only be heard by certain living things. Then for humans, which type of sound can be heard by humans. Humans can only hear audiosonic sounds.

The human ear can hear sounds with frequencies between 20 Hz – 20,000 Hz. However, not all humans can hear sounds with this frequency range because every human being has a different hearing capacity.

### Frequency in Statistics

The term frequency is also used in the context of statistics. In this context it is better known as the frequency distribution. Frequency distribution is the state of how a data (variable) which can be represented by numbers appears or is spread out in a row of numbers or groups of existing data.

Frequency distribution can also be interpreted as the arrangement of data based on certain interval classes arranged from the smallest to the largest based on certain categories. The presentation of the data with this frequency distribution is done so that the data is easier to understand and read.

The frequency distribution in the context of statistics is divided into several types. The following are the types of frequencies used in the context of statistics.

• Ordinary Frequency Distribution

The usual frequency distribution is a frequency distribution that contains the number of frequencies from each data group. This frequency distribution is still divided into two types, namely the event frequency distribution and the numerical frequency distribution.

• Cumulative Frequency Distribution

Then there is the cumulative frequency distribution, namely the frequency distribution which contains the result of the sum of the frequencies. This frequency distribution consists of two kinds, namely the cumulative frequency distribution of more than and less than.

• Relative Frequency Distribution

Finally, there is the relative frequency distribution, which contains the quotient value between the class frequency and the number of observations. This frequency distribution is obtained by dividing the frequency by the amount of power observed.

### Frequency In Health Science

The term frequency is also used in the medical world, which is to indicate how many (frequency) breaths a person takes in one minute or what is called the respiratory rate. Normal respiratory rate ranges are different for adults and children.

• Frequency of Human Breathing Rate:

The respiratory rate for adults ranges from 12-20 breaths/minute. Meanwhile for children it also varies. For children aged from 10-15 years, the respiratory rate is between 15-20 breaths/minute.

Children aged 5-7 years have a respiratory rate of 25-30 times/minute, children aged 1 year 30-40 times/minute and newborns 40-60 times/minute.

This respiratory rate is regulated by the respiratory center in the brain. The frequency varies according to the body’s needs of each person. This can be seen from the normal respiratory rate data, where the older you get, the less you breathe per minute.

Well, now it has been explained in general that frequency is a measure of the amount that is measured or calculated in one unit of time. Because the term frequency is used in many different contexts, it is necessary to first understand the meaning or meaning in each of these contexts.

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