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Topic: Electromagnetic wave


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In the News (Sun 26 May 19)

  
  Electromagnetic Wave Transmission
Electromagnetic wave transmission is the transmission of electrical energy by wires, the broadcasting of radio signals, and the phenomenon of visible light are all examples of the propagation of electromagnetic energy.
An electromagnetic wave does not penetrate far into an electrical conductor, and a wave that is incident on the surface of a good conductor is largely reflected.
The waves emitted from a source are oscillatory and are described in terms of frequency of oscillation.
www.measurement-testing.com /Electromagnetic-wave-transmission.html   (821 words)

  
  Wave article - Wave electromagnetic radiation gravitational radiation medium oscillates - What-Means.com   (Site not responding. Last check: )
Apart from electromagnetic radiation, and probably gravitational radiation, which can travel through vacuum, waves exist in a medium (which on deformation is capable of producing elastic restoring forces) through which they travel and can transfer energy from one place to another without any of the particles of the medium being displaced permanently; i.e.
The amplitude of a wave is the measure of the magnitude of the maximum disturbance in the medium during one wave cycle, and is measured in units depending on the type of wave.
For examples, waves on a string have an amplitude expressed as a distance (meters), sound waves as pressure (pascals) and electromagnetic waves as the amplitude of the electric field (volts/meter).
www.what-means.com /encyclopedia/Wave   (834 words)

  
 Electromagnetic radiation - Wikipedia, the free encyclopedia
The physics of electromagnetic radiation is electrodynamics, a subfield of electromagnetism.
The frequency of a wave is its rate of oscillation and is measured in hertz, the SI unit of frequency, equal to one oscillation per second.
As a wave, it is characterized by a velocity (the speed of light), wavelength, and frequency.
en.wikipedia.org /wiki/Electromagnetic_radiation   (1463 words)

  
 Electromagnetic field - Wikipedia, the free encyclopedia
In the physics of electromagnetism, an electromagnetic field is a field composed of two related vector fields: the electric field and the magnetic field.
Fortunately, the laws of electromagnetism and conservation of energy being what they are, an initial disturbance (acceleration) of the electric fluid will cause a feedback loop that, being negative, will tend to extinguish itself at its source but which will propagate outwards in what is called an electromagnetic wave.
The tensor character of this combined electromagnetic field implies that the field is anisotropic with respect to the velocity of the charged particle on which it produces a force: the Lorentz force varies with the velocity of the charged particle.
en.wikipedia.org /wiki/Electromagnetic_field   (1744 words)

  
 Electromagnetic Waves
Light, microwaves, x-rays, and TV and radio transmissions are all kinds of electromagnetic waves.
The wave, or "disturbance," is in an invisible thing called the electric force field.
Without these charged particles, there can be no electric force fields and thus no electromagnetic waves.
www.colorado.edu /physics/2000/waves_particles   (114 words)

  
 Categories of Waves
One way to categorize waves is on the basis of the direction of movement of the individual particles of the medium relative to the direction which the waves travel.
While waves which travel within the depths of the ocean are longitudinal waves, the waves which travel along the surface of the oceans are referred to as surface waves.
At the location where the wave is introduced into the medium, the particles which are displaced from their equilibrium position always moves in the same direction as the source of the vibration.
www.glenbrook.k12.il.us /gbssci/phys/Class/waves/u10l1c.html   (1550 words)

  
 Interpreting the Electromagnetic Wave Spectrum
Electromagnetic waves are the consequence of all this bumping.
Electromagnetic waves, unlike sound (physical) waves can move through a vacuum for they do not require a medium for their existence.
Sound wave, it is not an electromagnetic wave but a physical wave.
www.msnucleus.org /membership/html/k-6/as/physics/5/asp5_3a.html   (534 words)

  
 Olympus Microscopy Resource Center: Light and Color - Electromagnetic Radiation: Interactive Java Tutorial
Electromagnetic radiation, the larger family of wave-like phenomena to which visible light belongs (also known as radiant energy), is the primary vehicle transporting energy through the vast reaches of the universe.
An electromagnetic wave travels or propagates in a direction that is oriented at right angles to the vibrations of both the electric (E) and magnetic (B) oscillating field vectors, transporting energy from the radiation source to an undetermined final destination.
A standard measure of all electromagnetic radiation is the magnitude of the wavelength (in a vacuum), which is usually stated in units of nanometers (one-thousandth of a micrometer) for the visible light portion of the spectrum.
www.olympusmicro.com /primer/java/electromagnetic   (794 words)

  
 Electromagnetic waves
An electromagnetic wave (such as a radio wave) propagates outwards from the source (an antenna, perhaps) at the speed of light.
The energy carried by an electromagnetic wave is proportional to the frequency of the wave.
Electromagnetic waves that are of higher energy than visible light (higher frequency, shorter wavelength) include ultraviolet light, X-rays, and gamma rays.
physics.bu.edu /~duffy/PY106/EMWaves.html   (923 words)

  
 Light as a Wave
Thus, the period of any wave, measured as some amount of time per cycle, is in fact the time interval that corresponds to the physical wavelength of the signal.
The frequency of the wave is the inverse or reciprocal of the period.
The wave theory of light was happily adopted and accepted until it was found to fail to explain some observed and measured phenomena, in consistent and repeatable experiments.
www.play-hookey.com /optics/light_as_wave.html   (1189 words)

  
 Electromagnetic Waves
Perhaps the greatest theoretical achievement of physics in the 19th century was the discovery of electromagnetic waves.
Gradually other electromagnetic waves were found The wave nature of light causes different colors to be reflected differently by a surface ruled in fine parallel scratches--which is why a compact laser disk (for music or computer use) shimmers in all colors of the rainbow.
Electromagnetic waves led to radio and television, and to a huge electronic industry.
www-istp.gsfc.nasa.gov /Education/wemwaves.html   (1007 words)

  
 The Transverse Electromagnetic Wave
The basic transverse electromagnetic wave, as shown to the left, involves both a varying electric field and a varying magnetic field, appearing at right angles to each other and to the direction of travel of the wave.
Beyond that, the electromagnetic wave is generated or emitted over time, so a different part of the wave is not only at a different physical location, it was also created at a different time.
The relationship between the electric and magnetic fields in the wave is also in keeping with the phase relationship between voltage and current in a transmission line and in any antenna system — the signal voltage (which produces the electric field) and the signal current (producing the magnetic field) are in quadrature.
www.play-hookey.com /optics/transverse_electromagnetic_wave.html   (1100 words)

  
 Wave Kinematics
For example, sound waves are pressure variations which deform the air (or other medium) in which they travel; even empty space serves as a medium for electromagnetic waves (ie., light or radio waves).
Transverse waves disturb the medium at right angles to their direction of travel, while longitudinal waves disturb the medium in the same direction as they are travelling.
Finally, the amplitude (A) of a wave is the distance from the resting (equilibrium) state of the medium to the peak of the wave.
www.rwc.uc.edu /koehler/biophys/9a.html   (902 words)

  
 electromagnetic radiation on Encyclopedia.com
Thus, an electromagnetic wave is a transverse wave.
Light is a type of electromagnetic radiation, occupying only a small portion of the possible spectrum of this energy.
Electromagnetic Spectrum The radio portion of the entire spectrum of radiation is from 3 kHz to 300 GHz.
www.encyclopedia.com /html/e1/electrom-r.asp   (714 words)

  
 Electromagnetic wave absorption material and an associated device patent   (Site not responding. Last check: )
The purpose of the present invention is to provide an easy-to-manufacture electromagnetic wave absorption material usable from submillimeter wave region to millimeter wave region with an excellent radio wave absorbing performance and a variety of usage thereof.
The present invention is characterized by an electromagnetic wave absorption material comprised of a dispersions of at least one of the materials: a multi-layer hollow globule of carbon, a schungite carbon, and the schungite ore; mixed into a matter having a high electrical resistivity.
Thereby, the electromagnetic wave absorbing performance for an oblique incidence of electromagnetic wave is improved or becomes being capable of accommodating electromagnetic wave of wide range of frequencies.
www.freshpatents.com /Electromagnetic-wave-absorption-material-and-an-associated-device-dt20050217ptan20050035896.php   (1671 words)

  
 Olympus Microscopy Resource Center: Physics of Light and Color - Basic Electromagnetic Wave Properties: Interactive ...
Electromagnetic radiation is characterized by a broad range of wavelengths and frequencies, each associated with a specific intensity (or amplitude) and quantity of energy.
An electromagnetic wave moves or propagates in a direction that is at right angles to the vibrations of both the electric and magnetic oscillating field vectors, carrying energy from its radiation source to undetermined final destination.
The standard unit for all electromagnetic radiation is the magnitude of the wavelength (in a vacuum), which is usually reported in terms of nanometers for the visible light portion of the spectrum.
www.olympusmicro.com /primer/java/wavebasics   (823 words)

  
 The Physics Classroom
Mechanical waves, unlike electromagnetic waves, require the presence of a material medium in order to transport their energy from one location to another.
When an electromagnetic wave impinges upon the atoms of a material, the energy of that wave is absorbed.
Once the energy of the electromagnetic wave is re-emitted by an atom, it travels through a small region of space between atoms.
www.physicsclassroom.com /mmedia/waves/em.html   (433 words)

  
 THE ELECTROMAGNETIC COMPANION WAVE   (Site not responding. Last check: )
The companion wave is a mode of free space communication where the electric and the magnetic fields of the wave do not bear the same relationship among themselves as in an electromagnetic wave.
Abstract: The concept of a magnetic ‘companion wave’ arising when an electromagnetic wave is superimposed on a static magnetic field in vacuum is discussed.
The companion wave is then shown to be as real and observable as the electromagnetic wave, and also to have the possibility of carrying information.
www.geocities.com /bibhasde/companion.html   (268 words)

  
 [No title]
If the two vectors of the electromagnetic wave of a photon could be brought to spin, not as in the case of a circular polarized wave, but as in the case of the electron model shown in Figures 1 and 2, then it might create a magnetic dipole and an electric monopole.
Note that the counter-clockwise spinning electromagnetic wave which is shown as a dark straight line in Figure 1 is actually a sectional view of a planar wave front with the maximum (or nodal) electromagnetic magnitude.
Therefore, the required length contraction is due to the wavicle's spin of its electromagnetic wave, coupled with the fact that the direction of propagation of an electromagnetic wave must always be at right angles to the direction of both its electric and magnetic fields.
mypage.direct.ca /c/christie/Wavicle.html   (7283 words)

  
 WHO | What are electromagnetic fields?
In the electromagnetic spectrum, gamma rays given off by radioactive materials, cosmic rays and X-rays carry this property and are called 'ionizing radiation'.
Man-made sources of electromagnetic fields that form a major part of industrialized life - electricity, microwaves and radiofrequency fields – are found at the relatively long wavelength and low frequency end of the electromagnetic spectrum and their quanta are unable to break chemical bonds.
In an electromagnetic wave, these two characteristics are directly related to each other: the higher the frequency the shorter the wavelength.
www.who.int /peh-emf/about/WhatisEMF/en   (1685 words)

  
 Modern Physics   (Site not responding. Last check: )
Maxwell's Electromagnetic wave theory was one of the crowning achievements of 19
Under ordinary circumstances the wave nature of moving objects not significant because their w_______________ are too s________.
In order for the wave properties of matter to be noticeable, the matter wavelength must be the same size or larger than the objects with which it interacts.
www.crcs.k12.ny.us /physics/notes/modern/modern_note.htm   (1821 words)

  
 OLYMPUS MIC-D: Interactive Java Tutorial - Electromagnetic Wave   (Site not responding. Last check: )
The Wavelength slider can be translated to vary the frequency and wavelength of the electromagnetic wave between 100 and 1000 nanometers (from the ultraviolet through the visible to the infrared region of the spectrum).
Every form of electromagnetic radiation, including visible light, oscillates in a periodic fashion with peaks and valleys, and displays a characteristic amplitude, wavelength, and frequency that define the direction, energy, and intensity of the radiation.
The standard unit of measure for all electromagnetic radiation is the magnitude of the wavelength (in a vacuum), which is usually reported in terms of nanometers for the visible light portion of the spectrum.
www.mic-d.com /java/electromagneticwave   (456 words)

  
 Electromagnetic Spectrum   (Site not responding. Last check: )
The electromagnetic spectrum is a continuum of all electromagnetic waves arranged according to frequency and wavelength.
Electromagnetic energy passes through space at the speed of light in the form of sinusoidal waves.
The micron is the basic unit for measuring the wavelength of electomagnetic waves.
www.geo.mtu.edu /rs/back/spectrum   (154 words)

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