Everything on the planet has its frequency. According to one version, it is even the basis of our world. Alas, the theory is very complex to state it in a single publication, therefore we will consider only the frequency of oscillations as an independent action. Within the article, the definition of this physical process, its units of measurement and the metrological component will be given. And at the end, an example of the importance of ordinary sound in ordinary life will be considered. We learn what he is and what his nature is.
What is called the oscillation frequency?
By this is meant a physical quantity that is used to characterize a periodic process, which is equal to the number of repetitions or occurrences of certain events per unit of time. This indicator is calculated as the ratio of the number of these incidents to the time period during which they were committed. Each element of the world has its own oscillation frequency. The body, the atom, the road bridge, the train, the plane — they all make certain movements that are called that. Let these processes are not visible to the eye, they are. The units of measurement, in which the oscillation frequency is considered, are hertz. They received their name in honor of the German-born physicist Heinrich Hertz.
The periodic signal can be characterized by the instantaneous frequency, which, to the accuracy of the coefficient, is the rate of change of the phase. It can be represented as a sum of harmonic spectral components with their own constant oscillations.
Cyclic oscillation frequency
It is convenient to use it in theoretical physics, especially in the section on electromagnetism. Cyclic frequency (also called radial, circular, angular) is a physical quantity that is used to denote the intensity of the origin of the oscillatory or rotational motion. The first is expressed in revolutions or oscillations per second. With rotational motion, the frequency is equal to the modulus of the vector of angular velocity.
The expression of this indicator is carried out in radians for one second. The dimension of the cyclic frequency is the inverse of time. In numerical terms, it equals the number of oscillations or revolutions that occurred in the number of seconds 2π. Its introduction to use allows you to significantly simplify the various range of formulas in electronics and theoretical physics. The most popular example of use is the calculation of the resonant cyclic frequency of an oscillating LC circuit. Other formulas may become more complex.
Discrete event frequency
This value implies a value that is equal to the number of discrete events that occur per unit of time. In theory, the indicator is usually used - second to minus first degree. In practice, to express the frequency of the pulses, hertz is usually used.
Under her understand a physical quantity that equals the number of complete rotations that occur per unit time. It also employs the rate – second in minus first degrees. To denote the work done can use phrases such as revolution per minute, hour, day, month, year and others.
But what to do with the production? For them, arbitrary values were fixed: a kilo cycle, a megacycle per second, and so on. Therefore, taking in hand a device that works with the indicator in GHz (as a computer processor), you can roughly imagine how many actions it performs. It would seem that time slowly stretches for a person. But for the same period, technology manages to perform millions and even billions of operations per second. In one hour, the computer already does so many actions that most people cannot even represent them in numerical terms.
The oscillation frequency has been applied even in metrology. Various devices have many functions:
- Measure the frequency of the pulses. They are represented by electron-counting and capacitor types.
- Determine the frequency of the spectral components. There are heterodyne and resonant types.
- Spectrum analysis is performed.
- Reproduce the desired frequency with desired accuracy. This can be a variety of measures: standards, synthesizers, signal generators and other equipment in this direction.
- They compare the indicators of the received oscillations, for these purposes they use a comparator or an oscilloscope.
Work Example: Sound
All the above can be quite difficult to understand, because we used the dry language of physics. To understand the information given, you can give an example. Everything will be described in detail in it, based on the analysis of cases from modern life. To do this, consider the most famous example of vibrations - sound. Its properties, as well as the peculiarities of the implementation of mechanical elastic vibrations in the medium, are directly dependent on the frequency.
Human hearing organs can pick up vibrations that range from 20 Hz to 20 kHz. And with age, the upper limit will gradually decrease. If the frequency of sound oscillations falls below 20 Hz (which corresponds to the subcontractase), then infrasound will be created. This type, which in most cases is not heard to us, people can still feel it is necessary. When exceeding the limit of 20 kilohertz oscillations are generated, which are called ultrasound. If the frequency exceeds 1 GHz, then in this case we will deal with a hypersound. If we consider such a musical instrument as a piano, then it can create oscillations in the range from 27.5 Hz to 4186 Hz. It should be borne in mind that the musical sound does not consist only of the fundamental frequency - overtones and harmonics are mixed with it. This all together determines the timbre.
As you had the opportunity to learn, the oscillation frequency is an extremely important component that allows our world to function. Thanks to her, we can hear, with her assistance, computers work and many other useful things are performed. But if the oscillation frequency exceeds the optimal limit, then certain damage can begin. So, if you influence the processor so that its crystal works with twice as large numbers, it will quickly fail.
Similar can be brought about with human life, when at high frequency his eardrums burst. Also, there will be other negative changes with the body, which will entail certain problems, including death. Moreover, due to the peculiarity of the physical nature, this process will stretch out over a rather long period of time. By the way, taking into account this factor, the military are considering new opportunities for developing weapons of the future.