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Topic: Interference

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In the News (Sun 21 Apr 19)

  Interference - Wikipedia, the free encyclopedia
Interference is the superposition of two or more waves resulting in a new wave pattern.
As most commonly used, the term usually refers to the interference of waves which are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency.
However, in general white light is less suited for producing clear interference patterns, as it is a mix of a full spectrum of colours, that each have different spacing of the interference fringes.
en.wikipedia.org /wiki/Interference   (512 words)

 The Physics Classroom
The interference of waves causes the medium to take on a shape which results from the net effect of the two individual waves upon the particles of the medium.
The interference of sound waves causes the particles of the medium to behave in a manner that reflects the net effect of the two individual waves upon the particles.
Interference can occur as the result of sound from two speakers meeting at the same location as well as the result of sound from a speaker meeting with sound reflected off the walls and ceilings.
www.physicsclassroom.com /Class/sound/U11L3a.html   (2415 words)

 Interference: Defining the Source
Interference is any unwanted radio frequency signal that prevents you from watching television, listening to your radio or stereo, or talking on your cordless telephone.
Interference may prevent reception altogether, may cause only a temporary loss of a signal, or may affect the quality of the sound or picture produced by your equipment.
A simple method of determining the location of electrical interference is by using a portable AM radio tuned to a quiet frequency at the lower end of the dial.
www.fcc.gov /cgb/consumerfacts/interference.html   (837 words)

Interference can be experienced as a hum, buzz, crackle, or feedback whine through a hearing aid, competing with and often entirely masking the sound source one is trying to hear.
The interference produced by the demodulation of a high frequency EM signal is generated by both the electrical and magnetic components of this signal.
The level of interference is dependent on both the strength of the EM field and the relative immunity of the hearing aid to EM interference.
www.access-board.gov /research/interference.htm   (1636 words)

 Interference of Waves
In this case, a sine trough with an amplitude of -1 unit (negative means a downward displacement) interferes with a sine trough with a displacement of -1 unit.
When two waves interfere, the resulting displacement of the medium at any location is the algebraic sum of the displacements of the individual waves at that same location.
In actuality, the task of determining the complete shape of the entire medium during interference demands that the principle of superposition be applied for every point (or nearly every point) along the medium.
www.glenbrook.k12.il.us /gbssci/phys/Class/waves/u10l3c.html   (1340 words)

 The Physics Classroom
For example, the interference of a crest with a trough is an example of destructive interference.
Interference principles were first introduced in Unit 10 of The Physics Classroom.
Whenever light constructively interferes (crest meets crest or trough meets trough), the two waves act to reinforce one another and to produce a "super light wave." On the other hand, whenever light destructively interferes (crest meets trough), the two waves act to destroy each other and produce no light wave.
www.physicsclassroom.com /Class/light/U12L1b.html   (1558 words)

 Interference of Sound
If their amplitudes add, the interference is said to be constructive interference, and destructive interference if they are "out of phase" and subtract.
Interference of incident and reflected waves is essential to the production of resonant standing waves.
Interference has far reaching consequences in sound because of the production of "beats" between two frequencies which interfere with each other.
hyperphysics.phy-astr.gsu.edu /hbase/sound/interf.html   (281 words)

 FCC Interference Handbook - Courtesy of Radioing.com
Interference is any unwanted signal which precludes reception of the best possible signal from the source that you want to receive.
Interference may prevent reception altogether, may cause only a temporary loss of the desired signal, or may affect the quality of the sound or picture produced by your equipment.
Electrical interference many times will be seen as two or three horizontal lines on the television screen and may be accompanied by a loud buzzing or sizzling sound through the TV speakers or stereo system.
www.radioing.com /eengineer/documents/fccbook.html   (5040 words)

The result of adding two waves of the same frequency depends on the value of the phase of the wave at the point in which the waves are added.
When the light from the two sources is projected on a screen, an interference pattern is observed.
To explain the origin of the interference pattern, consider the distance traveled from the two sources.
members.tripod.com /~vsg/interfer.htm   (241 words)

 Townsend and Townsend and Crew - Interference Practice
An interference is a sophisticated and complex proceeding that can have profound implications on a company's patent portfolio - or the portfolio of one of its competitors.
An interference can also be used as part of a litigation strategy, since the burden of proof changes and civil proceedings are typically stayed pending the decision in the interference contest.
A key to success in an interference contest is having qualified attorneys that are familiar with the intricacies of the rules and procedures in litigating an interference at the Patent and Trademark Office.
www.townsend.com /practice/practiceDetails.asp?o=Interference   (548 words)

 Guidance for Submission of BPL Interference Complaints
Hams who believe they are having interference from a BPL system should carefully follow all of the steps in this document to report it to the involved utility company, BPL provider and to the FCC in a way that will help demonstrate the extent of BPL interference and to help the involved parties resolve it.
Amateurs having an interference complaint should preferably have the interference witnessed locally by a technically qualified observer (such as an ARRL Technical Coordinator, Technical Specialist, local-club interference committee), then ask the ARRL Laboratory to review it for technical accuracy and proper form before submitting it to the FCC.
A description of the interference, including the equipment being interfered with, the frequencies on which interference occurred, and what effect the interference has on your use of the spectrum (that is, does it prevent or degrade reception, interrupt ongoing communications, etc.).
p1k.arrl.org /~ehare/bpl/complaints.html   (3178 words)

The interference pattern was a set of alternating bright and dark lines, corresponding to where the light from one slit was alternately constructively and destructively interfering with the light from the second slit.
You might think it would be easier to simply set up two light sources and look at their interference pattern, but the phase relationship between the waves is critically important, and two sources tend to have a randomly varying phase relationship.
Applying this to the two slits, each slit acts as a source of light of the same wavelength, with the light from the two slits interfering constructively or destructively to produce an interference pattern of bright and dark lines.
physics.bu.edu /~duffy/PY106/Interference.html   (999 words)

 Interference -- The Hardball Times
If the umpire declares the batter, batter runner, or a runner out for interference, all other runners shall return to the last base that was in the judgment of the umpire, legally touched at the time of the interference, unless otherwise provided by these rules.
Umpiring expert Jim Booth, in his excellent discussion of interference, states that for an interference call to be made on a runner in the first base lane, it would have to be "obviously intentional".
A-Rod's conduct, as it was determined by the umpires to be intentional interference, was certainly unsportsmanlike conduct - the umpire therefore has the authority (and, I would argue, the duty) under Rule 9.01(d) to eject a player for unsportsmanlike conduct.
www.hardballtimes.com /main/article/interference   (1269 words)

 Interference Colors   (Site not responding. Last check: 2007-10-22)
The interference colors also appear when a flat piece of glass is laid on top of another (known in this case as Newton's fringes).
Light is partially reflected from the top interface (between the film and the ambient which is usually air) and from the lower interface (between the film and the material that the film is on).
So, the amount of light of a single wavelength that is reflected by the film depends on the film thickness, the angle of incidence, the wavelength and three indices of refraction.
home3.netcarrier.com /~chan/EM/PROGRAMS/THINFILM   (896 words)

 Dueling with Cordless Phones
It's important that you learn as much as possible about what causes interference and what to do to minimize its impacts in order to maximize performance.
Just keep in mind that the interference is just as great when operating the wireless device near the base station, even if the phone is far away.
A surprising problem was that voice conversations over the cordless phone would crackle substantially while throughput tests were being run within close proximity to the phone or the base station.
www.wi-fiplanet.com /tutorials/article.php/3290381   (700 words)

 ARRLWeb: Broadband Over Power Line (BPL) and Amateur Radio
Summary: This is a case history of severe interference to Amateur Radio from a device that had been Verified under FCC Part 15 to be in compliance with the rules.
ARRL appreciates that those involved acted appropriately, but this serves as a good case history about the level and degree of interference that can come from devices that are at the current FCC limits, and of the costs to industry that can result if interference is not mitigated at a product's initial design.
Interference is among the many issues covered by this financial and technical analysis of BPL.
www.arrl.org /tis/info/HTML/plc/interference.html   (2451 words)

 Television Interference
This sporadic interference generally occurs when an electrical accessory starts up or is operating.
The source of interference is probably outside your home.
When the television receives two different signals at the same time, there may be interference.
www.selfhelpandmore.com /interference/tv/tvshowall.htm   (1399 words)

 Radio Astronomy and Interference
Radio astronomers do much on their own to minimize the effect of interfering signals, from locating radio telescopes far from urban centers whenever possible to designing their antennas and electronic equipment with features that reduce interference.
There are numerous examples of situations in which a radio observatory and a transmitting facility have cooperated to implement a technical solution allowing both to achieve their objectives.
For example, in 1958, the National Radio Quiet Zone was established to minimize possible harmful interference to the NRAO in Green Bank.
www.nrao.edu /whatisra/rfi.shtml   (1096 words)

 Interference - An educational interference simulator
Study the interference of two circular waves.It is often hard to obtain good results with a ripple tank.
Five activities included which may be modified or you may create your own.
Interference pattern with data for the waves interfering at a point on a nodal line.
www.ottisoft.com /interfer.htm   (103 words)

If the interference is on continuously it may be caused by powerline equipment.
If your VCRis receiving interference, replacing connecting wires with shielded wire(coaxial cable) or replacing push- on connectors with screw-on connectors may solve the problem.
If you cannot eliminate the interference using the above techniques you should consider purchasing an interference free telephone which has been specifically designed to be immune to interference.
www.firecommunications.com /tvibook.html   (4946 words)

 Technorati Tag: interference   (Site not responding. Last check: 2007-10-22)
Interference at MSN Shopping Save on today's high-quality CDs, soundtracks, box sets and more.
Post Shinobi Doodles April 5th, 2006 by KT A break from the girls, here’s a couple of sketches I did in pen at a house party after the Adam F glee on...
April 2nd, 2006 by KT A number of characters in Interference have implants called ‘Nanotats’, which are programable...
www.technorati.com /tag/interference   (449 words)

 TV interference
The following pages illustrate what many common types of interference look like on a TV set.
This pattern may appear on your TV screen if you are picking up signals from an FM broadcast transmitter.
You should especially be on the lookout for loose or un-terminated cables.
www.bellscb.com /cb_radio_hobby/tvibook.htm   (5058 words)

Not only does Interference bring the rock (and the roll), they help you find the fun in your life.
Whether sitting alone in your room half dancing and half banging your head (while clapping or swaying preferably), or standing at one of their live shows dodging Jayson as he runs into the audience, you just enjoy them.
Well, those who waited it out are reaping the rewards, because Interference is coming back full force and better than ever.
www.myspace.com /interference   (1120 words)

 Experiments on Wave Interference
The bright areas are peaks, and the dark areas are troughs.
You can also see these waves moving as they interfere with each other.
Oh, I can see where the waves are acting to amplify and cancel each other by the dark and light areas.
www.colorado.edu /physics/2000/schroedinger   (404 words)

 Interference: The Stroop Effect
Because experience has taught you that word meaning is more important than ink color, interference occurs when you try to pay attention only to the ink color.
The interference effect suggests you're not always in complete control of what you pay attention to.
Stroop, J. Studies of interference in serial verbal reactions.
www.apa.org /science/stroop.html   (276 words)

 Interference   (Site not responding. Last check: 2007-10-22)
Fergus is now working on a new Interference album for 2006....
The concerts in the Czech and Slovak republics (Summer 2005) were truly an amazing experience, much of it was filmed and a documentary of the music and the 'on the road' experiences of Fergus and his merry men (and women) should be screened sometime next year.
Latest (June, 2004): such is the reaction to the 'Other Voices' show that Interference are now in the process of releasing a CD (entitled 'Live at St.James Church, Dingle') of their television performance (already for sale at gigs and at the shop).
www.interference.ie   (144 words)

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