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SOUND definition: 1. something that you can hear or that can be heard: 2. the activity of recording and broadcasting…. Learn more.
1. a. : a particular auditory impression : tone. b. : the sensation perceived by the sense of hearing. c. : mechanical radiant energy that is transmitted by longitudinal pressure waves in a material medium (such as air) and is the objective cause of hearing. 2. a. : a speech sound. a peculiar r-sound. b. : value in terms of speech sounds.
- Overview
- Plane waves
- Wavelength, period, and frequency
sound, a mechanical disturbance from a state of equilibrium that propagates through an elastic material medium. A purely subjective definition of sound is also possible, as that which is perceived by the ear, but such a definition is not particularly illuminating and is unduly restrictive, for it is useful to speak of sounds that cannot be heard by the human ear, such as those that are produced by dog whistles or by sonar equipment.
The study of sound should begin with the properties of sound waves. There are two basic types of wave, transverse and longitudinal, differentiated by the way in which the wave is propagated. In a transverse wave, such as the wave generated in a stretched rope when one end is wiggled back and forth, the motion that constitutes the wave is perpendicular, or transverse, to the direction (along the rope) in which the wave is moving. An important family of transverse waves is generated by electromagnetic sources such as light or radio, in which the electric and magnetic fields constituting the wave oscillate perpendicular to the direction of propagation.
Sound propagates through air or other mediums as a longitudinal wave, in which the mechanical vibration constituting the wave occurs along the direction of propagation of the wave. A longitudinal wave can be created in a coiled spring by squeezing several of the turns together to form a compression and then releasing them, allowing the compression to travel the length of the spring. Air can be viewed as being composed of layers analogous to such coils, with a sound wave propagating as layers of air “push” and “pull” at one another much like the compression moving down the spring.
A sound wave thus consists of alternating compressions and rarefactions, or regions of high pressure and low pressure, moving at a certain speed. Put another way, it consists of a periodic (that is, oscillating or vibrating) variation of pressure occurring around the equilibrium pressure prevailing at a particular time and place. Equilibrium pressure and the sinusoidal variations caused by passage of a pure sound wave (that is, a wave of a single frequency) are represented in Figure 1A and 1B, respectively.
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All About Physics Quiz
A discussion of sound waves and their propagation can begin with an examination of a plane wave of a single frequency passing through the air. A plane wave is a wave that propagates through space as a plane, rather than as a sphere of increasing radius. As such, it is not perfectly representative of sound (see below Circular and spherical waves). A...
Figure 1C is another representation of the sound wave illustrated in Figure 1B. As represented by the sinusoidal curve, the pressure variation in a sound wave repeats itself in space over a specific distance. This distance is known as the wavelength of the sound, usually measured in metres and represented by λ. As the wave propagates through the air, one full wavelength takes a certain time period to pass a specific point in space; this period, represented by T, is usually measured in fractions of a second. In addition, during each one-second time interval, a certain number of wavelengths pass a point in space. Known as the frequency of the sound wave, the number of wavelengths passing per second is traditionally measured in hertz or kilohertz and is represented by f.
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There is an inverse relation between a wave’s frequency and its period, such that
In physics, sound is a vibration that propagates as an acoustic wave through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain.
Sound is the vibration of a substance such as air, water, or other material. El sonido es la vibración de una sustancia, como el aire, el agua u otra materia. sound⇒ vi (seem) sonar⇒ vi : His words sounded strange. Is that the right word. It sounds wrong. Sus palabras sonaron extrañas. sound like [sth] vi + prep (have same sound as) sonar ...
[uncountable] continuous rapid movements (called vibrations) that travel through air or water and can be heard when they reach a person’s or an animal’s ear. Sound travels more slowly than light. aircraft that can fly faster than the speed of sound. Sound carries well over calm water. Oxford Collocations Dictionary. from television/radio.
14 de may. de 2016 · A sound is something that you hear. Peter heard the sound of gunfire. Liza was so frightened she couldn't make a sound. There was a splintering sound as the railing gave way. ...the sounds of children playing. Synonyms: noise, racket, din, report More Synonyms of sound. 2. uncountable noun.
