What is noise? Detailed answer

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What is noise? Detailed answer

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What is noise?

Sound is generated by mechanical vibrations. However, in order for these vibrations to become audible, they must occur in some medium: air, liquid, or solid. Through the medium, the vibration sound can reach the listener's ear. Oscillations can be correct, that is, in other words, the object creates waves in the medium that follow at strictly defined time intervals. In this case, the result is a melodic sound. However, if the vibrations are wrong, then their effect on our ears is much less pleasant.

The sound resulting from such vibrations is called noise. Sounds differ from each other in volume, pitch and timbre. The loudness of the sound depends partly on the distance of the listener's ear from the sounding object, and partly on the amplitude of the vibration of the latter.

The word amplitude means the distance that a body travels from one extreme point to another during its oscillations. The greater this distance, the louder the sound. The pitch of the sound depends on the speed or frequency of the vibrations of the body. The more vibrations an object makes in one second, the higher the sound it produces. However, two sounds that are absolutely identical in volume and pitch may differ from each other.

The musicality of a sound depends on the number and strength of the overtones present in it. If the string of a violin is made to oscillate along its entire length so that no additional vibrations occur, then the lowest tone that it can only produce will be heard. This tone is called the main tone.

However, if additional vibrations of individual parts occur on it, then additional higher notes will appear. Harmonizing with the main tone, they will create a special, violin sound. These notes, higher than the root, are called overtones. They determine the timbre of a particular sound.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What is skin?

Skin is the skin of an animal. Usually these are the skins of cows, horses, goats and pigs.

Cattle skins are the main source of leather raw materials. Calfskin is thinner, softer and lighter, which is why the most expensive shoes and bags are made from it. The skin of goats, both young and old, is called kid skin. Most suede leathers are kid skins, sanded on the side that was in direct proximity to soft tissues. Horse skins are used to make shoes, jackets and sports equipment.

Kangaroo skins are the most durable skins. They are used to make track and field and baseball shoes. Crocodile skin is used to make shoes, handbags, wallets and travel bags. Even the skins of snakes and lizards are used for the same purposes. Tanning makes animal skin soft and supple. Tannin, which is found in oak bark and is used in the tanning of hides, causes a chemical reaction. If some amendments are made to these chemical processes, then different types of leather are obtained.

Before tanning, the skin must be treated in a special way, "preserved". This is done in canneries where they are salted to keep them from rotting. After tanning, the leathers are treated with resins, shellac, and other chemicals that make them shiny. Dyes are added for color. Shiny leather surface becomes after coating it with varnish. Suede leather becomes if its surface is sanded or treated with sandpaper so that hairiness appears.

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Random news from the Archive

Vodka from water and air 08.11.2019

New York Air Co. developed a recipe for vodka, consisting only of water and air. No grains, no yeast, just electricity.

The company turns carbon from air into pure ethanol by electrically splitting water into hydrogen and oxygen. The carbon, oxygen and hydrogen atoms then recombine to form "environmentally friendly" ethanol.

"The process is similar to photosynthesis, but more efficient," explains Air Co. CTO. Stafford Sheehan.

The technology of the Americans simplifies the production of vodka and at the same time cleans the air, taking carbon from the external environment. The company calculated that one bottle of vodka purifies the air like seven large trees. In other words, each bottle removes half a kilo of carbon dioxide, writes CNBC.

Air Co.'s air recycling machine takes up little space and is powered by solar energy. The only by-product in production is oxygen. Unlike other vodka companies, Air Co. no need for giant fields for grain.

The only negative for consumers may be the price - $ 65 per bottle. At first, it will be sold only in some bars and restaurants in New York, and in 2020 it will reach retailers. CNBC representatives tried Air Co. - they say, vodka is like vodka. The taste is indistinguishable from the usual.

However, on one Air Co. will not stop. The company is going to produce perfumes and cleaning products for the home, adding to them ethanol produced using electricity.

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