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Thread: Electromagnetic radiation

  1. #1 Electromagnetic radiation 
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    After researching why light is considered to be magnetic I came across the Faraday Effect: http://en.wikipedia.org/wiki/Faraday_effect

    "This resonance causes waves to be decomposed into two circularly polarized rays which propagate at different speeds"

    Do they mean that the electric and magnetic components separate from each other, or that both are equally divided together?

    "EM radiation has an electric and magnetic field component which oscillate in phase perpendicular to each other and to the direction of energy propagation."

    Does this only deal with the wave part of the light, or are the actual photons composed of two perpendicular oscillating phases?

    Are the waves literally perpendicular to each other or is this only a representation?

    "The Faraday effect is a result of ferromagnetic resonance when the permittivity of a material is represented by a tensor"

    What kind of resonance is this? What parts of the material does it deal with? How does it act so that the preceding effects can occur?

    I do not understand why the rotation of the phase plane would allow for a magnetic field to interact with light. What sort of ferromagnetic resonance are they talking about? How is water, or any other clear medium ferromagnetic? If it is, then why cant we magnetize it?

    http://en.wikipedia.org/wiki/Electromagnetic_radiation


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  3. #2 Re: Electromagnetic radiation 
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    Quote Originally Posted by Cold Fusion

    "EM radiation has an electric and magnetic field component which oscillate in phase perpendicular to each other and to the direction of energy propagation."

    Does this only deal with the wave part of the light, or are the actual photons composed of two perpendicular oscillating phases?

    Are the waves literally perpendicular to each other or is this only a representation?
    Treating light/EM radiation as a wave, the electric and magnetic field components are actually perpendicular to one another, and this is a result of Maxwell's field equations for electromagnetism. Any oscillating electric field creates an oscillating magnetic field which acts perpendicularly to it.

    Photons are just the quanta of light, deriving from quantum theory, and observations of things like the photoelectric effect.... it doesn't really make sense to talk about them in terms of electric and magnetic fields, as they are really just localised 'particles'.

    Hope that helps.


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  4. #3  
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    Yes. Light is very strange.
    Of all the wonders in the universe, none is likely more fascinating and complicated than human nature.

    "Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."

    "Great spirits have always found violent opposition from mediocrities. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence"

    -Einstein

    http://boinc.berkeley.edu/download.php

    Use your computing strength for science!
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  5. #4 Re: Electromagnetic radiation 
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    Quote Originally Posted by Cold Fusion
    After researching why light is considered to be magnetic I came across the Faraday Effect: http://en.wikipedia.org/wiki/Faraday_effect

    "This resonance causes waves to be decomposed into two circularly polarized rays which propagate at different speeds"

    Do they mean that the electric and magnetic components separate from each other, or that both are equally divided together?

    "EM radiation has an electric and magnetic field component which oscillate in phase perpendicular to each other and to the direction of energy propagation."

    Does this only deal with the wave part of the light, or are the actual photons composed of two perpendicular oscillating phases?

    Are the waves literally perpendicular to each other or is this only a representation?

    "The Faraday effect is a result of ferromagnetic resonance when the permittivity of a material is represented by a tensor"

    What kind of resonance is this? What parts of the material does it deal with? How does it act so that the preceding effects can occur?

    I do not understand why the rotation of the phase plane would allow for a magnetic field to interact with light. What sort of ferromagnetic resonance are they talking about? How is water, or any other clear medium ferromagnetic? If it is, then why cant we magnetize it?

    http://en.wikipedia.org/wiki/Electromagnetic_radiation

    Oxygen in water is a paramagnetic and is attracted like iron, between the North an South poles of a magnet. A needle of iron will try to touch both poles. It is 500,000 times weaker then iron though.

    Aluminum is a diamagnetic and is repelled between the North and South poles of a magnet. It turns 90 degrees to the flow between the poles. A needle of diamagnetic material, tries to get away from the poles of the magnet.


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    William McCormick
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