Speed of sound This is not a constant, the speed of light, but depends mainly on the medium that p

Along with the picture, sound is one of the most important carrier of information not only for us but for a lot of other creatures that inhabit Earth. Furthermore, we use sound to calculate distances for communication or control the masses. I went flying speed of our equipment, we have composed symphonies to harmonize with the universe and I sent into space for other civilizations to communicate our message of peace. Let's discover together the science that "propel" sound.
What is sound and how it spreads? Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid or gas, composed of audible frequencies and a high level sufficient to be heard. Frequencies audible to us humans is in the range of 20 Hz to 20,000 Hz, but none of the limits is not set in stone. As the upper limit, it is reduced with age. Scientists have discovered that hearing even begins to suffer changes from a young age (14-15 years old). They delivered high frequency sounds that are inaudible to adults but children annoys the hell out. The best friend of man hear higher frequencies than us, but if the subwoofer nastro (bass speaker) from the living room audio system beeps frequency below 40 Hz, it will remain regardless. The sound can be spread through any form of matter, but can not pass through vacuum. nastro
Speed of sound This is not a constant, the speed of light, but depends mainly on the medium that propagates. Moreover, the materials are cataloged nastro and after the fundamental property of sound. In addition, the speed of sound depends on the ambient conditions. For example, the gas and the air we breathe, the speed of sound depends on the temperature. At sea level and a temperature of 200 C, sound travels at a speed of about 343 m / sec (1230 km / h). Things change dramatically in terms of fresh water at the same temperature, where the speed of sound is much higher, of 1482 m / sec (5335 km / h). It is an amazing value, nastro undoubtedly, but pales before the speed of sound in a metal such as steel: 5.960 m / s (21,460 km / h) Mysteries frequencies Frequency (Hz) Description 16-32 are the frequencies that feel vibration and also the lowest marks obtained in a tubular organ. 32-512 This section find rhythmic frequencies. Here is also the lowest and highest notes of the bass. 1024 - 2048 is also called the frequency in this range phone that is played best human speech. 4096 - 8192 in this range are the sounds that give "presence" of human speech. 16384-32768 frequencies brightness. There are sounds of bells and cymbals.
From natural drums musical instruments sounds are probably the earliest memories of men. Without them there would be no communication and no music. They produce in ancient times and the first complex devices and artificial reproduction of sounds are musical instruments. Archaeologists nastro have discovered the wind instruments nastro of animal bones that date back more than 50,000 years. Menestreii then were probably more respected than today's musicians simply because at that time there were no automatic devices or sound recording reproduction. nastro And this is where our story begins. If you live in Persia 850 years, surely you have heard of the three brothers suspected Mūsā. Not only because they are credited with inventing the first mechanical nastro musical instrument, an organ fed by water power, which play music on some cylinder which automatically change (!) And 99 other marvelous inventions and automatically flute - attention! - Programmable. Flute sounds nastro were produced with steam under pressure, and his master he could adjust after several patterns to get different sounds. All of these were published in a large book, aptly named without modesty Kitab al-Hiyal (book of ingenious devices). Among these is the pneumatic jack, although we work with him on our journey through the world of sound. In his book "The Museum of Music: A History of Mechanical Instruments", published in 1967, Charles B. Fowler said about automatic flute was actually a "robot nastro orchestra performed over 50 facial and body movements during each selected songs" . Automatic Music As the steam which had lain for hundreds of years in scrolls up to be recognized miraculous nastro powers, automated tools for sound reproduction had to regain bucuroşii rule only since the nineteenth century. The summit is that "come" is a completely different mechanical technology highly respected nastro today: watchmaking. In 1796 Swiss watchmaker