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Topic: Sound wave

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	Sound is a Mechanical Wave
		Sound is a wave which is created by vibrating objects and propagated through a medium from one location to another.
		If the sound wave is moving through air, then as one air particle is displaced from its equilibrium position, it exerts a push or pull on its nearest neighbors, causing them to be displaced from their equilibrium position.
		Since a sound wave is a disturbance which is transported through a medium via the mechanism of particle-to-particle interaction, a sound wave is characterized as a mechanical wave.
	www.glenbrook.k12.il.us /gbssci/phys/Class/sound/u11l1a.html (1291 words)

	Reflection of Waves
		It also means that the sound intensity near a hard surface is enhanced because the reflected wave adds to the incident wave, giving a pressure amplitude that is twice as great in a thin "pressure zone" near the surface.
		The phase of the reflected sound waves from hard surfaces and the reflection of string waves from their ends determines whether the interference of the reflected and incident waves will be constructive or destructive.
		The sound intensity near a hard surface is enhanced because the reflected wave adds to the incident wave, giving a pressure amplitude that is twice as great in a thin "pressure zone" near the surface.
	hyperphysics.phy-astr.gsu.edu /hbase/sound/reflec.html (792 words)

	sound wave
		Sound waves are mechanical; unlike electromagnetic waves, they require vibration of their medium's molecules or particles (manifested in air as compressions and rarefactions of the air), and this is why sound cannot travel through a vacuum.
		Sound can be produced by the vibrations of objects such as the stretched strings of a violin or air particles in wind instruments; the sounds of the voice are produced by air causing the ‘strings’ of the vocal cords to vibrate.
		Sound waves can be reflected to produce echoes, and diffracted to produce interference patterns of louder and softer sound.
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0030384.html (456 words)

	Sound Wave Applet
		The speed of transmission of the sound remains a constant regardless of the frequency or the wavelength since the speed only depends on the state of the air not on the characteristics of the generating source.
		The Mach wave now becomes conical and the angle of the cone depends on the ratio of the speed of sound to the speed of the object; the faster the speed of the object the sharper (smaller) the cone angle.
		The ratio of the object speed to the speed of sound is the Mach number of the flow, which explains the name "Mach wave".
	www.grc.nasa.gov /WWW/K-12/airplane/sndwave.html (779 words)

	Sound Waves
		In sound waves, p and ρ vary little from their steady values (by less than one part in a thousand), and v is much less than the phase velocity of sound.
		A plane wave propagating in a thermally stratified atmosphere can be represented by a ray normal to the wave front whose inclination to the horizontal changes so that the velocity with which the line of intersection of the wave front with a horizontal plane moves, called the trace velocity, is constant.
		The reflection of sound from solids is a rather complex study, because of the variety of surfaces and the existence of transverse waves in solids.
	www.du.edu /~jcalvert/waves/soundwav.htm (9029 words)

	Transverse and Longitudinal Waves (Site not responding. Last check: )
		For transverse waves the displacement of the medium is perpendicular to the direction of propagation of the wave.
		In longitudinal waves the displacement of the medium is parallel to the propagation of the wave.
		The air motion which accompanies the passage of the sound wave will be back and forth in the direction of the propagation of the sound, a characteristic of longitudinal waves.
	hyperphysics.phy-astr.gsu.edu /hbase/sound/tralon.html (282 words)

	The Soundry: The Physics of Sound (Site not responding. Last check: )
		The period of a wave is the time required for one complete cycle of the wave to pass by a point.
		The amplitude of a sound is represented by the height of the wave.
		The frequency of a sound wave is measured in hertz.
	library.thinkquest.org /19537/Physics3.html (329 words)

	Acoustical Society of America - The Wave Theory of Sound
		The analogy with water waves was strengthened by the belief that air motion associated with musical sounds is oscillatory and by the observation that sound travels with a finite speed.
		Gassendi (a contemporary of Mersenne and Galileo), for example, argued that sound is due to a stream of "atoms" emitted by the sounding body; velocity of sound is the speed of atoms; frequency is number emitted per unit time.
		The mathematical analysis was limited to waves of constant frequency, employed a number of circuitous devices and approximations, and suffered from an incomplete definition of terminology and concepts.
	asa.aip.org /pierce.html (1099 words)

	The Incredible Sound Wave - Dandy Designs - Does God Exist? - MarApr99
		Sound waves are a completely different phenomena which share many of the properties of light waves and yet are remarkably different.
		Sound waves are put into the material in a longitudinal way and compress and stretch the material as shown in Box B. Unlike light waves, sound waves have no mass and can only exist if there is a material for the wave to react with.
		Sound waves are a dynamic part of our world and speak to us of its design in a unique way.
	www.doesgodexist.org /MarApr99/TheIncredibleSoundWave.html (423 words)

	Illuminations: Sound Wave
		Frequently sound is described using terms such as pitch, tone, frequency, intensity or loudness.
		To understand the origins of these terms as well as to understand the mathematical models used to represent sound, this applet can help you to explore the dynamics of a sound wave.
		The sound wave is controlled by two parameters: the amount of initial energy put into the string (initial displacement) and the amount of tension in the string.
	illuminations.nctm.org /ActivityDetail.aspx?ID=37 (306 words)

	Physics News Graphics: Hyper-Focusing a Sound Wave
		Movie, based on data from a laser interferometer, depicts a "hyperfocusing" of a sound wave using time-reversal acoustics, in which a device produces a reversed version of a sound wave and sends it back to its original location.
		The point at which the wave focuses acts as a "sink" which absorbs the energy of the sound wave.
		To achieve hyperfocusing, it is crucial to time-reverse all of the initial sound wave, including its "near field" components, the fields that exist within a wavelength around the source of the sound.
	www.aip.org /png/2002/160.htm (198 words)

	Sound Wave Energy - Healing the mental, emotional, spiritual, and physical aspects of the person
		Sound Wave Energy was founded in 1992 by French-Canadian Nicole La Voie.
		Nicole is the creator of the sound wave energy technology (vibrational frequencies), she is an international lecturer, and author of "Return to Harmony: Creating Harmony and Balance through the Frequencies of Sound."
		This led her to develop the system of frequencies known as Sound Wave Energy (SWE), which has healed her, her son, and many others' with challenges, at all levels.
	www.harmonyera.com (927 words)

	Sound Theme Unit
		The pitch of a sound depends on the ____ of the sound wave.
		A sound that is repeated because the sound wave reflected or bounced back from a distant object.
		The loudness of a sound depends on the ____ of the sound wave.
	www.edhelper.com /SoundTheme6528.htm (646 words)

	UA astronomer ties a star's death to strong sound wave \| www.azstarnet.com ®
		The model shows that the oscillations within the core of the star are so strong that they eventually turn into sound waves, essentially restarting the halted explosion.
		The resulting force from the sound wave that drives the explosion has been estimated at roughly the equivalent of 10 percent of the total energy the sun will radiate during its lifetime, Burrows said.
		While Burrows' discovery focuses on sound waves' role in core collapse, Wheeler contends that a star's magnetic fields must also be accounted for in the model for a more accurate picture.
	www.azstarnet.com /allheadlines/117855 (614 words)

	Why does sound wave travel faster in a denser medium whereas light travels slower?
		Sound is a mechanical wave and travels by compression and rarefaction of the medium.
		Sound is essentially a pressure wave which causes the medium (i.e.
		Hence we can argue that since a medium is required for sound to propagate, and that the closer the molecules in that medium are to each other the faster the sound will travel.
	www.physlink.com /Education/AskExperts/ae81.cfm (538 words)

	Sound Processing
		It was not quite as satisfying a sound as the mechanical click of the standard IBM keyboards at the time, but it had the advantage that it could be changed or completely turned off.
		The first sound cards made for IBM compatible computers had very limited capabilities, but they were a substantial improvement over the basic computer which had no sound capabilities to speak of.
		The frequency of a sound wave determines the pitch or tone of the sound.
	kmh.yeungnam-c.ac.kr /Multimedia/SoundProcessing.html (3730 words)

	Sound waves
		Sound is caused by small areas of high and low pressure progragating outward from the source.
		The complex wave for an [i] will be composed of a different set of frequencies than the complex wave for [a].
		We need a way to separate a complex sound wave out into its component frequencies (and their amplitudes) so that we can see what makes vowels different.
	www.umanitoba.ca /faculties/arts/linguistics/russell/138/sec4/acoust1.htm (494 words)

	Sound & Wave Motion
		You will be able to experiment with wave generation, propagation, reflection, interference, and diffraction.
		This classic toy is also a very useful tool for demonstrating both traverse and longitudinal wave motions.
		Measure sound wave lengths and determine the speed of sound with this inexpensive resonance kit.
	www.hometrainingtools.com /catalog/physical-science-physics/cat_sound-wave-motion.html (282 words)

	Sound Wave Energy - RESEARCH
		Manners correlated different harmonic frequencies that are the healthy resonant frequencies of various parts of the body.
		is grateful to Archway Wildlife Rehabilitation Inc., for participating in a study, using the Sound Wave Energy recordings, at their facility in Boulder, CO. Below are the results that the Operations Director, Annette Archambeau, reported.
		The results, from the sound wave study on people, were just as amazing.
	www.harmonyera.com /1.2.research.htm (1066 words)

	MYSound - Central Long Island Sound Station - Wave Panel
		Wave height is determined using zero-crossing analysis of the surface water elevation.
		The significant wave height is the average height of the highest one third of the waves.
		The significant wave period is the average period of the significant wave height.
	www.mysound.uconn.edu /clis_wave.html (150 words)

	Physics Demonstrations - Sound
		Sound appears to be a topic distinct from motion and heat.
		A dramatic illustration of the variation of the speed of sound with the density of a gas is performed by breathing a low density and a high density gas and talking as the gas is expelled from the lungs.
		This demonstration illustrates that a sound wave is a compressional wave with a characteristic frequency.
	sprott.physics.wisc.edu /demobook/chapter3.htm (7341 words)

	PhysicsLAB: Introduction to Sound
		Sound waves are mechanical, compression waves which are in general longitudinal in nature - meaning that the particles vibrate parallel to the direction of the wave's velocity.
		If only a single disturbance creates a sound wave, such as a ball crashing into a bat, or a tree falling in a forest, that disturbance is not repetitive and does not result in a periodic wave, it would instead be called a pulse.
		In the same medium, all sound waves travel at the same speed. For example, suppose you are at a concert. As the orchestra plays, you hear all of the notes as they are played - except for the time required for the music to reach your location.
	dev.physicslab.org /Document.aspx?doctype=3&filename=WavesSound_IntroSound.xml (853 words)

	Sound Waves - Succeed in Physical Science: School for Champions
		Since the velocity of sound is approximately the same for all wavelengths, frequency is often used to better describe the effects of the different wavelengths.
		Sound can also be created by vibrating an object in a liquid such as water or in a solid such as iron.
		The sound waves vibrate your ear drum, which goes to the inner ear and is changed to nerve signals you can sense.
	www.school-for-champions.com /science/sound.htm (1327 words)

	Sound Waves
		Three characteristics are used to describe a sound wave.
		Amplitude; this is the measure of the amount of energy in a sound wave.
		Remember the amplitude, or height of a sound wave is a measure of the amount of energy in the wave.
	sln.fi.edu /fellows/fellow2/apr99/soundvib.html (206 words)

	musicand
		For a wave traveling from left to right, as viewed from a stationary point, this velocity is at one moment to the left, and then to the right, reversing direction at the frequency of the sound wave.
		Looking at the entire wave at one instant in time, there are bands where the velocity is to the left, alternating with bands where it is towards the right.
		Standing waves occur in a room mainly at frequencies below 100 Hz, and are responsible for room resonances, which are discussed in the section on room acoustics.
	www.silcom.com /~aludwig/musicand.htm (2292 words)

	fUSION Anomaly. Sound Wave Energy
		waves of energy, but it was considered useless as a power source because at high levels sound waves distort into shock waves.
		But Lucas discovered that by sending sound waves through empty containers of various shapes, the shock waves were eliminated.
		His company, Macrosonix, is working on sound wave compressors which might one day do everything from cool refrigerators and air conditioners in the home to running compressors in factories and on construction sites.
	fusionanomaly.net /soundwaveenergy.html (393 words)

	The Nature of Sound
		Sound waves diffract easily at wavelengths larger than the diameter of the human head (around 500 Hz wavelength equals 69 cm).
		As a longitudinal wave, sound is a rapid variation in pressure that propagates.
		The amplitude of a sound wave corresponds to its intensity or loudness.
	hypertextbook.com /physics/waves/sound (1530 words)

	Third Grade - Science - Overview - March
		Sounds that have a high pitch, such as a whistle, a squeal, a bird chirping, are made by something vibrating fast.
		Sounds that have a low pitch, such as the rumble of a truck engine, the boom of a bass drum or a dog growling, are made by something vibrating more slowly.
		Sound waves vibrate the ear drum which vibrates the ear bones which vibrate the liquid inside the cochlea which vibrates the hairs in the cochlea which are connected to nerves that send messages to the auditory nerve and on to the brain.
	www.cstone.net /~bcp/3/3MrSci.htm (7293 words)

	What Is Sound (Site not responding. Last check: )
		Sound is mechanical energy in the form of pressure variances in an elastic medium.
		When two sounds with a slightly different frequency are combined, the listener will have the impression that there is a single sound, but its loudness (amplitude) will pulsate as the contributing sounds (waveforms) are alternately in phase and out of phase.
		Attack is the point in time when the sound begins and is the single most important part of the sounds for the ear to determine the individuality of the sound.
	www.ec.vanderbilt.edu /computermusic/musc216site/what.is.sound.html (2726 words)

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