21. Physics Demonstrations - Sound 3. sound sound appears to be a topic distinct from motion and heat. However, we now understand sound to be an ordered motion of the molecules of the medium through which the http://sprott.physics.wisc.edu/demobook/chapter3.htm

SOUND Sound appears to be a topic distinct from motion and heat. However, we now understand sound to be an ordered motion of the molecules of the medium through which the sound propagates. The study of sound provides the opportunity to understand wave motion in preparation for the more abstract study of electromagnetic waves. The subject of sound should be of particular interest to anyone who enjoys music[1-7]. REFERENCES 1. J. Askill, Physics of Musical Sound , Van Nostrand: New York (1979). 2. M. J. Moravcsik, Musical Sound: An Introduction to the Physics of Music , Paragon House Publishers: New York (1987). 3. J. S. Rigden, Physics and the Sound of Music 4. T. D. Rossing, The Science of Sound , Addison Wesley Publishing Company: New York (1982). 5. H. E. White and D. H. White, Physics and Music 6. A. Wood, The Physics of Music 7. J. R. Pierce, The Science of Musical Sound , Scientific American Books, W. H. Freeman: New York (1983). Safety Considerations with Sound Most experiments involving sound are relatively safe except for the hazards not directly associated with the sound as discussed elsewhere. However, it is possible for very intense sounds to permanently damage the ear especially after prolonged exposure[1,2]. Consequently, in the demonstrations described here, the sound intensity should always be kept at a level well below the threshold of pain (see Table 3.1). As a general rule, prolonged exposure to sound levels above 85 dB will cause slight hearing loss and above 90 dB will result in mild to moderate loss. Prolonged exposure to sound levels above 95 dB causes moderate to severe hearing loss. Above 100 dB, even short exposure can cause a permanent loss of hearing.

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23. SoundSnooper - Voice Activated Recording Software sound activated recording software. Records all sound near computer with a sound card. http://www.sound-snooper.com/en/features.php

24. Sound - Definition And More From The Free Merriam-Webster Dictionary Definition of word from the MerriamWebster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. http://www.merriam-webster.com/dictionary/sound

25. HyperPhysics Concepts Speed of sound Wave relationship Ultrasound Infrasound http://hyperphysics.phy-astr.gsu.edu/hbase/sound/soucon.html

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27. Sound ..................................... sound is a vibration. When something makes a noise it is vibrating, and this causes air molecules around it to vibrate too. These vibrations are transmitted through the air, to http://www.worsleyschool.net/science/files/aboutsound/page.html

Sound is a vibration . When something makes a noise it is vibrating, and this causes air molecules around it to vibrate too. These vibrations are transmitted through the air, to our ears, where we perceive them as sound. You can actually see the effect of sound vibrations with an easy experiment. Get a bowl and cover the top with plastic sandwich wrap. Pull the plastic tight across the top in all directions until it is flat and smooth; tape it tight if necessary. Then sprinkle some salt onto the plastic. Now get a pot and spoon; hold them near the bowl and hit the bottom of the pot hard with the spoon. You should see the salt jump on the plastic. Try yelling loudly next to the bowl, and you may be able to make the salt jump using the vibrations from your voice. The loud noise you make is a vibration, which is transmitted through the air, to your ear and also to the plastic. The plastic vibrates, and makes the salt crystals jump! Let's examine how sounds from a vibrating object turn into sound you hear. How Sound is Made: When something vibrates, it moves back and forth. A vibrating object could be a speaker on a CD player, or your vocal cords, or the string on a guitar. As the object vibrates, it pushes the air molecules next to it closer together, in patterns corresponding to the movements of the object. These patterns of compressed air molecules bump into the ones next to them, passing on the pattern. In this way the original pattern of vibrations is sent through the air, as molecules continue to bump into their neighbours.

28. Theatre-Sound Mailing List Mailing list for people doing theatre sound. http://www.brooklyn.com/theatre-sound/

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30. Sound Wave: Definition From Answers.com n. A longitudinal pressure wave of audible or inaudible sound. http://www.answers.com/topic/sound

31. Download "South Park" Sounds Lots of links to sites where you can download sounds from South Park. http://animatedtv.about.com/cs/sound1/

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32. Sound - Wiktionary Healthy. He was safe and sound. Complete, solid, or secure. Fred assured me the floorboards were sound. (mathematics, logic) (argument, logical system) having the http://en.wiktionary.org/wiki/sound

sound Definition from Wiktionary, the free dictionary Jump to: navigation search See also Sound Contents English Alternative forms Pronunciation Etymology 1 ... edit English Wikipedia has an article on: Sound (disambiguation) Wikipedia Most common English words: clear pretty except #513: sound ... edit Alternative forms soune (obsolete) sowne (obsolete) edit Pronunciation IPA /saʊnd/ SAMPA /saUnd/ Audio (US) file Rhymes: -aʊnd edit Etymology 1 Old English gesund safe", "whole", "healthy edit Adjective sound comparative sounder superlative soundest ... Healthy He was safe and sound Complete solid , or secure Fred assured me the floorboards were sound mathematics logic argument logical system having the soundness property. , Rudolf M. Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian , volume V, page vii With fresh material, taxonomic conclusions are leavened by recognition that the material examined reflects the site it occupied; a herbarium packet gives one only a small fraction of the data desirable for sound conclusions. Herbarium material does not, indeed, allow one to extrapolate safely: what you see is what you get UK slang Good or a good thing.

33. "The Simpsons" - Download Sound And Music Clips Find sound files of quotes from all your favorites. http://simpsons.about.com/cs/sounds/

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34. Overview Of Sound Waves - Succeed In Understanding Physics: School For Champions SfC Home Physical Science Physics sound Explanation of Overview of sound Waves Succeed in Understanding Physics. Also refer to physical science, waveform, vibration http://www.school-for-champions.com/science/sound.htm

Where you gain knowledge, confidence and success Sound topics Overview of Sound Waves Creating Sound Waves Frequencies and Wavelengths of Sound Speed of Sound in a Gas ... Physics Explanation of Overview of Sound Waves - Succeed in Understanding Physics. Also refer to physical science, waveform, vibration, compression, matter, vacuum, characteristics, amplitude, volume, velocity, speed, air, frequency, wavelength, microphone, Ron Kurtus, School for Champions. Overview of Sound Waves by Ron Kurtus (revised 1 December 2009) Sound is a series of longitudinal or compression waves that move through air or other materials. Sound does not travel in a vacuum. Like any waveform, sound has the characteristics of wavelength, frequency, amplitude and speed or velocity. Sound waves are created by the vibration of some object, like the cone in a radio loudspeaker. The waves are detected when they cause a detector to vibrate. Questions you may have include: What is a description of sound? What are the characteristics of sound waves? How is sound created and detected?

35. The Sound Effects Gallery Auditionable sound effects, music samples, sample packs and royalty free music tracks. http://www.sound-effects-library.com

36. Sound - Definition Of Sound In The Medical Dictionary - By The Free Online Medic sound (sound) 1. a pressure wave propagating through an elastic medium; waves with a frequency of 20–20,000 Hz cause the sensation of hearing. http://medical-dictionary.thefreedictionary.com/sound

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