The Production sound Is a physical phenomenon that consists of the generation of noise in the different atmospheres of the atmosphere.
Thanks to the continuous presence of the air (main diffuser of sound) in the atmosphere, sound is a phenomenon to which we are exposed daily and at all times.
Different scientific studies have shown that whether something unpleasant, something deeper or severe, acute, higher or lower, everything around us emits a characteristic and particular sound.
It is important to clarify that the sound is nothing more than a vibration that travels by some means, be it air, water, among others. Simply, if there is void the sound can not exist because it does not expand.
What is the sound?
The sound is basically a vibration. The vibration of a body produces and gives rise to different compression waves, which precisely need some means to spread, propagate and transmit their energy. That's how they reach our ears.
Our brain , Processes the sound as different stimuli that make us react depending on the frequency and regularity of these vibrations. What we know as a simple noise, is nothing more than the irregular vibration of a body.
On the contrary, if we consider some sound as musical or harmonic, or simply, it is pleasing to our ears, it is because its vibration is regular and completely uniform.
It is important to mention that each to propagate the sound, it is necessary that the medium is elastic and can carry out its function.
The density of this medium will always be important in determining and influencing the speed of sound transmission. Generally, in liquid and solid media, sound always propagates at a higher velocity. The opposite occurs with gaseous media.
The most interesting thing is that sound is part of a phenomenon that transports energy (yes, sound is energy) without the need to move any body.
Simply, all its operation is based on mechanical waves produced by some body and transmitted through some material.
The vibrations of this body always occur and are directed in the same direction in which the sound propagates and disperses. Therefore, it is considered a longitudinal wave.
How does the sound come about?
Although in the previous paragraphs we have already mentioned a little about the production of sound and all the process that entails, in this part of the article we will dedicate ourselves to explain a little better and in greater depth how everything begins.
It is important to mention that there is always some sound around us and that for different reasons, we can ignore. Whether for its sound qualities (timbre, sonority, tone and duration) or because we really choose not to be fully aware of it.
The sound begins when some body at rest begins to emit vibrations that through some external factor, produces some type of sound. This sound is often initiated by contact or collision with another body.
For example, the guitar (or any other instrument) remains at rest and does not actually emit any sound until someone with their hand moves the strings and that vibration spreads through the air, having a characteristic and particular sound.
With the voice or some animal sound, it happens that the vocal cords are at rest, but at the moment of speaking, barking, or meowing, the vocal cords begin to vibrate and also through the air and thanks to their existence, our words and sounds Can be heard by other people.
As mentioned above, the speed of sound depends on the density of the medium in which it propagates. Likewise, other factors such as atmospheric pressure, climate or temperature of the place also influence (little, but they influence).
Sound and temperature
According to studies, the sound has a greater speed of propagation when the temperature is lower. In addition, this makes our ears easier to pick up and perceive any noise or harmony.
It is considered that at a higher temperature there is a greater slowness in the air to propagate the sound and thanks to this, has emerged the expression and phrase so common that it expresses that in the winter one hears better and more easily.
At the moment of vibration, the body produces certain waves and stimuli to the medium that is present in that situation.
In this sense, sound acts as a chain and propagates because the molecules of the air close to the body emitting the vibrations, expand and extend the waves with the medium and nearby particles.
These receptor particles, in turn, become transmitters and transmit to nearby molecules and so, until reaching a certain point.
Thanks to this, it can be deduced that the sound really has a small capacity of modification and vibration in the particles, because each change suffered is small. However, it is its chain action that generates great power and movement to sound.
What happens is not that the air particles close to the body that emits sound send the sound directly to the eardrum, but actually, their joint action causes the sound as it rolls from particulate to the receiver , That is, the ear.
Condensation and rarefaction zones
On the other hand, it is important to mention that this small movement that is generated and suffered by air particles (can also be water or other solid medium), in different and certain areas of the body generates a voltage and density of these particles themselves.
These areas are referred to as condensation zones and rarefaction zones.
Although the sound may be the same, its reception is subjective (especially when it comes to volume) and what for some people may be unpleasant or pleasant, very hard or too soft, for others it does not necessarily need to be Perceived in the same way or form.
References
- Handel, S., & Listening, A. (1991). An introduction to the perception of auditory events. MIT Press. Retrieved from: mitpress.mit.edu
- Miyara, F. (2003). Acoustics and sound systems. National University of Rosario. Recovered from: sea-acustica.es
- Nystuen, J.A., & Medwin, H. (1995). Underwater sound produced by rainfall: Secondary splashes of aerosols. The Journal of the Acoustical Society of America, 97 (3), 1606-1613. Retrieved from: asa.scitation.org
- Rose, G., Oksman, J., & Kataja, E. (1961). Round-the-World Sound Waves produced by the Nuclear Explosion on October 30, 1961 and their Effect on the Ionosphere at Sodankylä. Nature, 192 (4808), 1173-1174. Retrieved from: link.springer.com
- Sales, G. D., Milligan, S. R., & Khirnykh, K. (1999). Sources of sound in the laboratory animal environment: a survey of the sounds produced by procedures and equipment. Animal Welfare, 8 (2), 97-115. Retrieved from: ingentaconnect.com
- Vardhan, H., Adhikari, G. R., & Raj, M. G. (2009). Estimating rock properties using sound levels produced during drilling. International Journal of Rock Mechanics and Mining Sciences, 46 (3), 604-612. Retrieved from: sciencedirect.com.