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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. Depending on the type and style of the music, this criterion may vary to produce the desired effect. They made a sound when you poured water from them. Richard Seed of Chicago for his efforts to stoke up the world economy by cloning himself and other human beings.

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All classical and acoustical guitars – and all of the violin-family instruments – have braces on the inside of the soundboard whose primary function is to keep the soundboard from buckling under string tension. Seating geometry is arranged to give all the audience good sight lines and at the shortest distance from the stage. It is best to find the proper frequency beforehand using a digital frequency meter and to record the value (to a precision of at least one Hertz). Even though this creates many little resonant peaks in the response, the peaks are close together, so the average response is fairly flat.

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They also give rise to a 4th sound (another combination tone—high and faint) corresponding to the sum of the 2 vibration numbers: this is called a summation tone. Demonstrations of waves are included. - illustrated - From University of Manitoba - http://www.umanitoba.ca/faculties/arts/linguistics/russell/138/sec4/acoust1.htm WHOI Ocean Acoustics Lab __ The Woods Hole Oceanographic Institution's page has research information on acoustic monitoring of sediment transport, ocean acoustic tomography and Shallow Water Acoustic Propagation or SWARM.

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The loudness of a noise does not necessarily correlate with its sound level. Square or rectangular rooms with parallel surfaces are often prone to becoming unpleasant without considerable treatment, because the sound bounces back and forth between the surfaces forming what are called "Standing Waves. It's not "the ocean" but a few select frequencies amplified out of the noise that always surrounds us. With the supercardioid pattern we have a 6dB direct/reverberant ratio, so the reverberation is less than the direct sound by about 6dB.

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During this preliminary test, a tape measure was stretched down the center of the three isles. Over five or six years models of several different proposals for the two auditoria were made at 1-to-10 scale. This solution is inexpensive for new construction and is also an affordable way to renovate existing classrooms. If we also use harmonic waves, all the magnitudes can be related to one another as in the plane-wave case, but now some of them are vectors.

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Often students working on research will ask for volunteer assistance ( check this list ) to help conduct a certain step of their research. The job of ensuring good acoustics naturally fell to the designers of the heating and ventilation systems since they all relied on the common medium of the air. Transform the values of noise reduction to sound transmission loss, using the correction 10*log (S/A). This applet will help you understand the displacement and pressure graphs of sound waves in pipes.

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Try holding your fingers so that they strike the table at different times. A brief confession: We have been in deep, disappointed denial about missing the Acoustics '08 meeting, but let it not be said that we cannot selflessly set side our private pain to bring you some of the fascinating research news that's emerged as a result of all that accumulated brain power. Air cavities exhibit a single resonant frequency called a Helmholtz resonance.

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The time the sound takes to go from the source of the sound to the listening device (a hydrophone) is measured. Most of Wollaston's original work' deals more or less directly with chemical subjects, but diverges on all sides into optics, acoustics, mineralogy, astronomy, physiology, botany and even art. They showed that their simpler formula retained a similar accuracy of fit, and therefore invoked "Occam's razor" to suggest that their equations are preferable, at least in so far as they provide a simpler physical understanding.

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Ron Hubbard, ardent author of science fiction and founding father of Scientology, for his crackling Good Book, " Dianetics ," which is highly profitable to mankind or to a portion thereof. To understand sound, music, and hearing, we must understand the physics of waves. Although reverberation is due to continued multiple reflections, controlling the Reverberation Time in a space does not ensure the space will be free from problems from reflections.

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I have been able to correlate the vibrational frequencies of bat barrels to measured performance, and have signicantly contributed to an understanding of the trampoline effect in a hollow bat. Disclaimer: No warranty is made for the accuracy of the contents of this FAQ. *** 1.1 What acoustics-related news groups and FAQs are there? "Newsgroups" (see http://groups.google.com/group/alt.sci.physics.acoustics/topics) stimulate discussions on all related topics: alt.sci.physics.acoustics - started by Angelo Campanella - now the principal group for discussion of acoustics topics.