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| {{About|audible acoustic waves}}
| | Ӏt's crucial tɦat you be wholеsome. It can help you awaken sensation better plus moгe fսll of energʏ during the day. Eating correctly is a must. Hеre are ѕeveral beneficial nutrients tips to help you go with a far better lifestyle.<br><br>It is crucіal that you do not skip your protein rеquires. Red meats ԝhich are slim, sսch as steaƙ, offer ɑ greаt souгce of protein. Pork and chicken are enough places, also. Health proteins is a very essential nutritіonal that helps with musсles progress and making you total moгe rapidly.<br><br>Always keep some proteins night clubs about and carry centered fooԀs should you usually journey frequеntly. Standard foods are hard to reсeive, especially if yօu are flying. You will be usually so hectic hurrying to hold back to youг flight, simply being reѕearched by stability or stuck with a foodlеss airplane that eating is merеly not much of a possibility. Consume a few of tɦese wholesomе pubs and have a comprehensive food when you can.<br><br>To ensure that the body has suffіcient heɑlthy proteіns, yоu can substitute a portion of reddish meat having a helping of Quinoa. It is probaƅlʏ the exceptional no-various mеats food products to consist of many cruciɑl aminos. It's аlso glutеn-totally free and offers the right natural vіtamins. Simply because Quinoa carries a gentle and nutty flаvour, additionally, it choices great, so you're guaranteed to have fun with this.<br><br>Try to eat reasonably in oгder to remain in total health. Bingіng can givе you much more nutritіon than you reqսire, causing you to be puffed up, away from sorts and also in excess fat storing functіon. This may decrease your inteгior finalizing potential [http://www.beautyflames.com/sis%C3%A4lt%C3%B6/eating-properly-simple-when-you-use-these-superb-advice vigrx plus wiki] plus [http://www.westhoustonp16.com/ForumRetrieve.aspx?ForumID=3999&TopicID=1412490&NoTemplate=False side effects of vigrx plus pills] permanent [[http://ankara.e-escort.asia/author/ajgnl/ http://ankara.e-escort.asia]] problems your health.<br><br>One of the better metҺods to increase уour meals are to remove microwаvɑble items. This can Ƅe essential as theѕe microwavable meals consist of a huge volume of all kinds of sugar ɑnd boԁƴ fat which are harmful. Purchase your greens and meat refreshing and cook thеm yߋurself to acquire one of the most well being benefit.<br><br>Microwɑvable foods are generally hаrmful so take advantage of the micro-wave moderately. To manipulate your unwanted weight and boost your look, yօu should makе surе to add more natural food items to your diet prοgram.<br><br>Although nuts arе extremely nutritious, you ѡill still need to selеct appropriatеly. Almonds are rich in fiber and great fаts, in addition tо being delicious.<br><br>Getting frսit jսice is a great option for individualѕ that do not such aѕ the function that is put into making vegetables and fresh fruits. Juice is the beѕt way to get vital vitamins and minerals and never have to spend time in craсking, cսtting uƿ or cooҝing. In order to avߋid harmful your pearly whites, choοse juices withօut the need of additional sugars, and drink them using a straw.<br><br>Add more seaweed to mealѕ. Typically the moѕt popular Ԁifferent vеrsions--dulse, kombu and nori--consist of a bеvy of nutritional supplements. Seaweed is actually a eating standard іn coast countrіes.<br><br>Refreshing beets really аre a fantastic foods to incorporate in your daily diet, jսst ƅe surе they aren't those who result from a can. Fresh beets will provide ʏou with a lot of vitamins and dietary fiber, but Ƅeets which can be canned may give yоu lots of salt. Attеmpt rapidly steaming some beet greens and adding beetroot foг your salads.<br><br>Natural fresh vegetables are very nutritious for you. They'll support settle those desires, help make үour reallƴ feel whole, and pгovide you with essential vitamins and nutrients. These are rarеly more advanceԁ to make and sɦop than man-made unheаlthy foods. They can be even neater than less complicatеd food items. Uncooked ցreens can prodսce a [https://Www.Google.com/search?hl=en&gl=us&tbm=nws&q=much-essential+harmony&btnI=lucky much-essential harmony] іn what you eat.<br><br>Here's ԝishing that thіs sսggestions earlier mentioned will be able to allow уou to while you mɑke alterations іn your diet plan. You shοuld exercise correct nourishment so that you can advertise a healtҺy body. Make an attempt to find οut about what ԁistinct nutrition your system needs. It will probably be worth youг time. |
| {{pp-move-indef|small=yes}}
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| [[File:Thoth08BigasDrumEvansChalmette.jpg|thumb|right|upright|A [[drum]] produces sound via a vibrating membrane.]]
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| '''Sound''' is a [[vibration]] that propagates as a [[mechanical wave]] of [[pressure]] and [[Particle displacement|displacement]], through some [[transmission medium|medium]] (such as [[air]] or [[water]]). Sometimes ''sound'' refers to only those vibrations with [[frequencies]] that are within the [[Hearing range|range of hearing]] for humans<ref>{{cite journal|title=The American Heritage Dictionary of the English Language, Fourth Edition|publisher=Houghton Mifflin Company|year=2000|url=http://www.bartleby.com/61/65/S0576500.html|archiveurl=http://web.archive.org/web/20080625012016/http://www.bartleby.com/61/65/S0576500.html|archivedate=June 25, 2008|accessdate=May 20, 2010}}</ref> or for a particular animal.
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| ==Acoustics==
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| {{main|Acoustics|Acoustical engineering}}
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| [[File:SennMicrophone.jpg|thumb|right|[[Audio engineers#Research and development|Audio engineers in R&D]] design audio equipment]]
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| [[Acoustics]] is the interdisciplinary science that deals with the study of all mechanical waves in gases, liquids, and solids including vibration, sound, ultrasound and infrasound. A scientist who works in the field of [[acoustics]] is an acoustician while someone working in the field of [[acoustical engineering]] may be called an acoustic engineer. (Not to be confused with an [[audio engineer]].) The application of acoustics can be seen in almost all aspects of modern society, subdisciplines include: [[aeroacoustics]], [[audio signal processing]], [[architectural acoustics]], [[bioacoustics]], electroacoustics, [[environmental noise]], [[musical acoustics]], [[noise control]], [[psychoacoustics]], [[speech]], [[ultrasound]], [[underwater acoustics]] and [[vibration]].<ref>{{cite web|last=Acoustical Society of America|title=PACS 2010 Regular Edition—Acoustics Appendix|url=http://www.aip.org/pacs/pacs2010/individuals/pacs2010_regular_edition/reg_acoustics_appendix.htm|accessdate=22 May 2013}}</ref>
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| ==Physics of sound==
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| ===Propagation of sound===
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| Sound propagates through compressible media such as air, water and solids as longitudinal waves and also as a transverse waves in solids (see [[#Longitudinal and transverse waves|Longitudinal and transverse waves]], below). The sound waves are generated by a sound source, such as the vibrating diaphragm of a stereo speaker. The sound source creates vibrations in the surrounding medium. As the source continues to vibrate the medium, the vibrations propagate away from the source at the speed of sound, thus forming the sound wave. At a fixed distance from the source, the pressure, velocity, and displacement of the medium vary in time. At an instant in time, the pressure, velocity, and displacement vary in space. Note that the particles of the medium do not travel with the sound wave. This is intuitively obvious for a solid, and ''the same'' is true for liquids and gases (that is, the vibrations of particles in the gas or liquid transport the vibrations, while the ''average'' position of the particles over time does not change). During propagation, waves can be [[Reflection (physics)|reflected]], [[Refraction|refracted]], or [[Attenuation|attenuated]] by the medium.<ref name="JHU">http://www.jhu.edu/virtlab/ray/acoustic.htm</ref>
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| The behavior of sound propagation is generally affected by three things:
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| * A relationship between [[density]] and pressure. This relationship, affected by temperature, determines the speed of sound within the medium.
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| * The propagation is also affected by the motion of the medium itself. For example, sound moving through wind. Independent of the motion of sound through the medium, if the medium is moving, the sound is further transported.
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| * The viscosity of the medium also affects the motion of sound waves. It determines the rate at which sound is attenuated. For many media, such as air or water, attenuation due to viscosity is negligible.
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| When sound is moving through a medium that does not have constant physical properties, it may be refracted (either dispersed or focused).<ref name="JHU" />
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| [[File:Spherical pressure waves.gif|thumb|right|260px|Spherical compression (longitudinal) waves]]
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| The mechanical vibrations that can be interpreted as sound are able to travel through all [[State of matter|forms of matter]]: [[gas]]es, [[liquid]]s, [[solid]]s, and [[plasma (physics)|plasmas]]. The matter that supports the sound is called the [[Transmission medium|medium]]. Sound cannot travel through a [[vacuum]].
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| ===Longitudinal and transverse waves===
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| Sound is transmitted through gases, plasma, and liquids as [[longitudinal wave]]s, also called [[compression (physical)|compression]] waves. Through solids, however, it can be transmitted as both longitudinal waves and [[transverse wave]]s. Longitudinal sound waves are waves of alternating [[pressure]] deviations from the [[Mechanical equilibrium|equilibrium]] pressure, causing local regions of [[compression (physical)|compression]] and [[rarefaction]], while [[transverse wave]]s (in solids) are waves of alternating [[shear stress]] at right angle to the direction of propagation.
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| The energy carried by an oscillating sound wave converts back and forth between the potential energy of the extra [[compression (physical)|compression]] (in case of longitudinal waves) or lateral displacement [[Strain (materials science)|strain]] (in case of transverse waves) of the matter, and the kinetic energy of the displacement velocity of particles of the medium.
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| ===Sound wave properties and characteristics===
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| [[File:Sine waves different frequencies.svg|thumb|right|260px|[[Sine wave|Sinusoidal waves]] of various frequencies; the bottom waves have higher frequencies than those above. The horizontal axis represents time.]]
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| Sound [[wave]]s are often simplified to a description in terms of [[Sine wave|sinusoidal]] [[plane wave]]s, which are characterized by these generic properties:
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| * [[Frequency]], or its inverse, the period
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| * [[Wavelength]]
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| * [[Wavenumber]]
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| * [[Amplitude]]
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| * [[Sound pressure]]
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| * [[Sound intensity]]
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| * [[Speed of sound]]
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| * [[Direction (geometry, geography)|Direction]]
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| Sound that is perceptible by humans has frequencies from about 20 Hz to 20,000 Hz. In air at [[standard temperature and pressure]], the corresponding wavelengths of sound waves range from 17 m to 17 mm.
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| Sometimes speed and direction are combined as a [[velocity]] [[Vector (geometric)|vector]]; wavenumber and direction are combined as a [[wave vector]].
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| [[Transverse wave]]s, also known as [[Shear stress|shear]] waves, have the additional property, ''[[Polarization (waves)|polarization]]'', and are not a characteristic of sound waves.
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| ===Speed of sound===
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| [[File:FA-18 Hornet breaking sound barrier (7 July 1999) - filtered.jpg|right|thumb|U.S. Navy [[F/A-18 Hornet|F/A-18]] approaching the sound barrier. The white halo is formed by condensed water droplets thought to result from a drop in air pressure around the aircraft (see [[Prandtl-Glauert Singularity]]).<ref>[http://antwrp.gsfc.nasa.gov/apod/ap070819.html APOD: 19 August 2007 – A Sonic Boom<!-- Bot generated title -->]</ref><ref>http://www.eng.vt.edu/fluids/msc/gallery/conden/mpegf14.htm</ref>]] | |
| <math></math> | |
| {{main|Speed of sound}}
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| The speed of sound depends on the medium the waves pass through, and is a fundamental property of the material.The first significant effort towards developing a formula to measure the speed of sound was made by Newton. he said that the speed of sound in a particular substance was equal to the square root of the pressure acting on it ([[Standard conditions for temperature and pressure|STP]]) divided by its density.
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| <math> | |
| c = \sqrt{ {p \over \rho}}\,
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| </math> | |
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| However it was later proved wrong and was giving wrong answers.So another scientist Laplace corrected the formula by deducting that the phenomenon of sound travelling is not isothermal, as believed by Newton, but adiabatic.He added another factor to the equation-''gamm''a and multiplied <math>
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| \sqrt{\gamma}\,
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| </math> to <math>\sqrt{ {p \over \rho}}\,</math> .Thus coming up with the equation <math>
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| c = \sqrt{\gamma \cdot {p \over \rho}}\,
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| </math> . Since <math> | |
| K = \gamma \cdot p\,
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| </math> therefore the final equation came up to be <math>
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| c = \sqrt{\frac{K}{\rho}}\,
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| </math> which is also known as the Newton-Laplace equation.in the equation K = elastic modulus and c = velocity of sound <math> {\rho}\,</math> = density.Thus, the speed of sound is proportional to the [[square root]] of the [[ratio]] of the [[elastic modulus]] (stiffness) of the medium to its [[density]].
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| Those physical properties and the speed of sound change with ambient conditions. For example, the speed of sound in gases depends on [[temperature]]. In {{convert|20|C|F|lk=on}} air at [[sea level]], the speed of sound is approximately {{convert|343|m/s|km/h mph|abbr=on|sigfig=3}} using the formula "v = (331 + 0.6 T) m/s". In fresh water, also at 20 °C, the speed of sound is approximately {{convert|1482|m/s|km/h mph|abbr=on|sigfig=4}}. In [[steel]], the speed of sound is about {{convert|5960|m/s|km/h mph|abbr=on|sigfig=4}}.<ref>[http://library.thinkquest.org/19537/Physics4.html The Soundry: The Physics of Sound]</ref> The speed of sound is also slightly sensitive (a second-order [[Anharmonicity|anharmonic]] effect) to the sound amplitude, which means that there are nonlinear propagation effects, such as the production of harmonics and mixed tones not present in the original sound (see [[parametric array]]).
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| ==Perception of sound==
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| [[File:Ear.jpg|thumb|right|150px|Human ear]]
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| The perception of sound in any organism is limited to a certain range of frequencies. For humans, hearing is normally limited to frequencies between about 20 [[Hertz|Hz]] and 20,000 Hz (20 [[kHz]]),<ref>{{cite journal|url=http://books.google.com/books?id=RUDTFBbb7jAC&pg=PA248|title=Music, Physics and Engineering|isbn=9780486217697|author1=Olson|first1=Harry F. Autor|year=1967}}</ref> although these limits are not definite. The upper limit generally decreases with age. Other [[species]] have a different range of hearing. For example, dogs can perceive vibrations higher than 20 kHz, but are deaf to anything below 40 Hz. As a signal perceived by one of the major [[sense]]s, sound is used by many species for [[defence mechanism (biology)|detecting danger]], [[navigation]], [[predation]], and [[communication]]. [[Earth]]'s [[atmosphere]], [[hydrosphere|water]], and virtually any [[physical phenomenon]], such as [[fire]], [[rain]], [[wind]], [[ocean surface wave|surf]], or [[earthquake]], produces (and is characterized by) its unique sounds. Many species, such as [[frog]]s, [[bird]]s, [[marine mammals|marine]] and terrestrial [[mammal]]s, have also developed special [[organ (anatomy)|organs]] to produce sound. In some species, these produce [[bird vocalization|song]] and [[speech communication|speech]]. Furthermore, [[human]]s have developed culture and technology (such as [[music]], [[telephone]] and [[radio]]) that allows them to generate, record, transmit, and broadcast sound. The scientific study of human sound perception is known as [[psychoacoustics]].
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| ===Noise===
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| {{main|Noise}}
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| Noise is a term often used to refer to an unwanted sound. In science and engineering, noise is an undesirable component that obscures a wanted signal.
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| ==Sound pressure level==
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| {{main|Sound pressure}}
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| {{Sound measurements}}
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| Sound pressure is the difference, in a given medium, between average local pressure and the pressure in the sound wave. A square of this difference (i.e., a square of the deviation from the equilibrium pressure) is usually averaged over time and/or space, and a square root of this average provides a [[root mean square]] (RMS) value. For example, 1 [[Pascal (unit)|Pa]] RMS sound pressure (94 dBSPL) in atmospheric air implies that the actual pressure in the sound wave oscillates between (1 atm <math>-\sqrt{2}</math> Pa) and (1 atm <math>+\sqrt{2}</math> Pa), that is between 101323.6 and 101326.4 Pa.
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| As the human ear can detect sounds with a wide range of amplitudes, sound pressure is often measured as a level on a logarithmic [[decibel]] scale. The '''sound pressure level''' (SPL) or ''L''<sub>p</sub> is defined as
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| :<math>
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| L_\mathrm{p}=10\, \log_{10}\left(\frac{{p}^2}{{p_\mathrm{ref}}^2}\right) =20\, \log_{10}\left(\frac{p}{p_\mathrm{ref}}\right)\mbox{ dB}\,
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| </math>
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| :where ''p'' is the [[root-mean-square]] sound pressure and <math>p_\mathrm{ref}</math> is a reference sound pressure. Commonly used reference sound pressures, defined in the standard [[American National Standards Institute|ANSI]] S1.1-1994, are 20 [[micropascal|µPa]] in air and 1 [[micropascal|µPa]] in water. Without a specified reference sound pressure, a value expressed in decibels cannot represent a sound pressure level.
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| Since the human [[ear]] does not have a flat [[Responsivity|spectral response]], sound pressures are often [[frequency]] weighted so that the measured level matches perceived levels more closely. The [[International Electrotechnical Commission]] (IEC) has defined several weighting schemes. [[A-weighting]] attempts to match the response of the human ear to noise and A-weighted sound pressure levels are labeled dBA. C-weighting is used to measure peak levels.
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| ==Equipment for dealing with sound==
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| Equipment for outputing or generating : [[musical instrument]], [[sound box]], [[Headphones|hearing phones]], [[sonar]] systems, [[sound reproduction]], and broadcasting equipment. Many of these use electro-acoustic transducers for input : [[microphone]]s .
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| ==Sound measurement==
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| * [[Decibel]], [[Sone]], [[Mel scale|mel]], [[Phon]], [[Hertz]]
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| * [[Sound pressure level]], [[Sound pressure]]
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| * [[Particle velocity]], [[Acoustic velocity]]
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| * [[Particle displacement]], [[Particle amplitude]], [[Particle acceleration]]
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| * [[Sound power]], [[Acoustic power]], [[Sound power level]]
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| * [[Sound energy flux]]
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| * [[Sound intensity]], [[Acoustic intensity]], [[Sound intensity level]]
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| * [[Acoustic impedance]], [[Sound impedance]], [[Characteristic impedance]]
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| * [[Speed of sound]], [[Amplitude]]
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| ==See also==
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| {{div col|cols=2}}
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| * [[Acoustic theory]]
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| * [[Beat (acoustics)|Beat]]
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| * [[Doppler effect]]
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| * [[Echo (phenomenon)|Echo]]
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| * [[Musical tone]]
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| * [[Pitch (music)|Pitch]]
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| * [[Resonance]]
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| * [[Reverberation]]
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| * [[Sonic weaponry]]
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| * [[Sound localization]]
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| * [[Soundproofing]]
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| * [[Structural acoustics]]
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| * [[Timbre]]
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| * [[Ultrasound]]
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| * [[List of unexplained sounds]]
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| {{div col end}}
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| ==References==
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| {{Reflist|2}}
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| ==External links==
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| {{wikiquote}}
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| {{wikibooks}}
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| {{commons category}}
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| {{Wikisource}}
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| {{Library resources box
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| |by=no
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| |onlinebooks=no
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| |others=no
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| |about=yes
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| |label=Sound }}
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| * [http://www.acoustics.salford.ac.uk/schools/index1.htm Sounds Amazing; a KS3/4 learning resource for sound and waves]
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| * [http://hyperphysics.phy-astr.gsu.edu/hbase/sound/soucon.html HyperPhysics: Sound and Hearing]
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| * [http://podcomplex.com/guide/physics.html Introduction to the Physics of Sound]
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| * [http://www.phys.unsw.edu.au/~jw/hearing.html Hearing curves and on-line hearing test]
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| * [http://www.audiodesignline.com/howto/audioprocessing/193303241 Audio for the 21st Century]
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| * [http://www.sengpielaudio.com/calculator-soundlevel.htm Conversion of sound units and levels]
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| * [http://www.sengpielaudio.com/Calculations03.htm Sound calculations]
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| * [http://www.audiocheck.net Audio Check: a free collection of audio tests and test tones playable on-line]
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| * [http://www.acoustics.salford.ac.uk/feschools/ More Sounds Amazing; a sixth-form learning resource about sound waves]
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| {{Acoustics}}
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| [[Category:Acoustics]]
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| [[Category:Hearing]]
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| [[Category:Waves]]
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| [[Category:Qualia]]
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| [[Category:Sound| ]]
| |
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