Noise pollution audit
Introduction
In physics, sound is any phenomenon that involves the propagation of mechanical waves through a fluid or solid medium with a frequency within the audible range (for humans between ). Above this frequency range are ultrasounds, and below that are infrasounds.
Sound consists of acoustic waves produced when air pressure oscillations are converted into mechanical waves in the human ear and perceived by the brain. The propagation of sound is similar in fluids, where sound takes the form of pressure fluctuations.[1] In solid bodies, sound propagation involves variations in the tensional state of the medium.
The propagation of sound involves the transport of energy without the transport of matter, in the form of mechanical waves that propagate through a solid, liquid or gaseous elastic medium. Among the most common are air and water.
Unlike electromagnetic waves, sound waves do not propagate in a vacuum. If the vibrations occur in the same direction in which the sound propagates, it is a longitudinal wave and if the vibrations are perpendicular to the direction of propagation, it is a transverse wave.
Acoustic phonetics focuses its interest especially on speech sounds: how they are generated, how they are perceived, and how they can be described graphically or quantitatively.
Physics of sound
Contenido
La física del sonido es estudiada por la acústica, que trata tanto de la propagación de las ondas sonoras en los diferentes tipos de medios continuos como la interacción de estas ondas sonoras con los cuerpos físicos.
sound propagation
Certain characteristics of fluids and solids influence the sound wave. That is why sound travels in solids and liquids more quickly than in gases. In general, the greater the compressibility (1/K) of the medium, the lower the speed of sound. Density is also an important factor in the speed of propagation, in general the lower the density (ρ), everything else being equal, the lower the speed of sound propagation. The speed of sound (v) is related to these magnitudes by the formula:.
In gases, temperature influences both compressibility and density, such that a very important factor is the temperature of the propagation medium.