Sound is the mechanical vibrations (position change back and forth) of molecules, atoms or particles made of the material and the material spread as waves. Sounds, like so many waves, characterized by frequency, wavelength, frequency, amplitude and velocity of propagation (speed of sound).
For human hearing, sound is often fluctuate, in the frequency range from 20 Hz to 20000 Hz range, the molecules of the air, and spread through the air, crashing into the eardrum, which vibrates the eardrum and stimulate the brain. But sound can be defined more broadly, depending on the application, including the higher frequency or lower frequency that the human ear can hear, not only spread in the air but also transmitted in any material. In this broad definition, the sound is a mechanical wave, and the wave-particle duality according to the material, this wave can also be considered a stream of particles spreads phonons, quantum particles of sound.
The noise and sound are the sounds of music. In the audio signal transmission, noise is random fluctuations do not carry the signal.
đang được dịch, vui lòng đợi..