Physics

# Characteristics of Sound

Sound in short but remarkable terms may be a vibration, that our ears percieve by the sense of hearing. most ordinarily vibrations visit our ears via the air. The ear then converts these sound waves into nerve impulses that are sent to our brains, where the impulses become sound. to mention all that during a more technical language: Sound “is an alternation in pressure, particle displacement, or particle velocity propagated in an elastic material” (Olson 1957). Sound is additionally a series of mechanical compressions rarefactions or longitudinal waves that successively propagate through media that are a minimum of a touch compressible. What causes sound waves is understood as “the source of waves”. samples of sounds sources is: A violin string that vibrates upon being bowed or plucked.

The four characteristics of sound are frequency, wavelength, velocity.

## Frequency

The frequency of sound is that the number of atmospheric pressure oscillations per second at a hard fast point occupied by a acoustic wave .

## Amplitude

The is that the magnitude of instantaneous sound pressure change within the wave. Basically this is often the utmost amount of pressure at any point within the acoustic wave . A acoustic wave is caused literally by increases in pressure at certain points causing a “domino effect” outward, the upper pressure points are the crests during a acoustic wave , and behind them are low points which tail them. These are referred to as the troughs on a wavelength graph. Sound’s propagation Velocity depends largely on the sort , temperature and pressure of the medium through which it propagates. Because air is almost an ideal gas, the speed of sound doesn’t depend upon atmospheric pressure .

## Frequency

The frequency range of sound that’s audible to humans is approx. between 20 and 20,000 Hz. This range in fact varies between individuals, and goes down as are age increases. Sounds will begin to wreck our ears at 85 dBSPL and sounds above approximately 130 dBSPL will cause pain, as a are referred to as the: “threshold of pain”. in fact again this range will vary among individuals and can change with age.