Explanation of the Sound
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Our voice, the sound of an instrument, the sound of a bird is all aspects of various ones of the same phenomenon: the sound. The sound is provoked from the vibrations of an elastic body and in order propagar itself it has need of means: air; any solid, liquid or gaseous substance. The sound is provoked through of the vibrations that produce to a succession of jams and expansions of molecules dell’ air. In their oscillating movement they form the concentric spherical sonorous waves said sonorous waves that they arrive to our ear therefore the sound is produced from the vibrations of a body and is provoked through other substances under sonorous wave shape. The rappresentazione of a sonorous wave When a sonorous wave is propaga not c’ it is a transport of matter, but an oscillating motion around their position of quiet. Un’ sonorous wave can be represented with a diagram from the waved form called sinusoid. Its high part is called crest (that it corresponds to the jam) while the part lowland comes called ventre (correspondent all’ expansion). The distance between the crest or ventre and lasse the x is l’ amplitude of the sound. While the distance between two ventri or two successive crests calls length d’ wave. The movement that door to the initial state them from the crest to the quiet ones comes called complete oscillation. Speed of propagation the speed of sound is various according to the means in which the propagation happens; in fact the speed is greater in the solid bodies, smaller in the liquids and still inferior in the gas. This happens because in the solid bodies the molecules more closely are tied between they transmitting, thus, better the sonorous waves to the contrarys of the liquids and of gas since their molecules they are more and more far between they. Through to complex calculations executed for the first time in France in the 1882 the speed of sound has been settled down that nell’ air is of 340m to the second. The substance in which the sound is provoked besides to determine the speed of sound attenuates and dampens the same sound, than, gradually she becomes more and more weak person. This effect more or less is emphasized in the various substances. In fact some substances attenuate less the sound than others thus rendering the propagation better. The substances that attenuate the good ones little come called good conductors, on the contrary the substances attenuate that come said it very acoustic or fonoassorbenti insulators. The liquids, the metals, the ground and the gas are of the good conductors; on the contrary the material, the rubber, the glass, the plastic, the polistirol are acoustic insulators, the cork and the cardboard. Characters symbols of the sound the several sounds distinguish themselves in: frequency, intensity and the stamp. The frequency is the number of complete oscillations (n) that completes a sonorous wave nell’ unit time (t), that is f=n/t. It measure in Hertz (Hz) that it corresponds to a complete oscillation of a sound in a second, 1 Hz= 1 oscillation to the second
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