Science > Physics > Source and absorber independence of free-space light propagation
| Topic: |
Science > Physics |
| User: |
"Sue..." |
| Date: |
14 Nov 2006 11:43:35 PM |
| Object: |
Source and absorber independence of free-space light propagation |
<< When an external electric field is applied to a real medium,
a current flows. The total current flowing within the medium
consists of two parts: a conduction and a displacement current.
The displacement current can be thought of as the elastic response
of the material to the applied electric field. As the magnitude of the
externally applied electric field is increased, an increasing amount
of energy is stored in the electric displacement field within the
material. If the electric field is subsequently decreased, the
material will release the stored electrostatic energy. The
displacement current reflects the resulting change in electrostatic
energy stored within the material. The electric displacement can
be separated into a vacuum contribution and one arising from
the material by... >> {Note function of =CF=87e ]
http://en.wikipedia.org/wiki/Permittivity
<<The electric susceptibility =CF=87e of a dielectric material is a
measure of how easily it polarizes in response to an electric
field. This, in turn, determines the electric permittivity of the
material and thus influences many other phenomena in that
medium, from the capacitance of capacitors to the
LQQKY ---> speed of light. <--- LQQKY
It is defined as the constant of proportionality (which may be a
tensor)
relating an electric field E to the induced dielectric polarization
density P such that...>>
http://en.wikipedia.org/wiki/Electric_susceptibility
<< Figure 5: The wave impedance of idealized electric and
magnetic field sources as a function of distance from
the source. The wave impedance is the ratio of electric
to magnetic fields. In the far field, it becomes 377 ohms
regardless of the details of the source .[or absorber]
structure. >>
http://www.conformity.com/0507/0507low.html
also:
http://en.wikipedia.org/wiki/Wave_impedance
Sue...
http://en.wikipedia.org/wiki/Multiple_integral
Time-independent Maxwell equations
Time-dependent Maxwell's equations
http://farside.ph.utexas.edu/teaching/em/lectures/lectures.html
Richard Fitzpatrick: Course taught
http://farside.ph.utexas.edu/teaching.html
http://web.mit.edu/8.02t/www/802TEAL3D/visualizations/light/index.htm
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| User: "Chatter Nougat Chew-Chew" |
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| Title: Re: Source and absorber independence of free-space light propagation |
15 Nov 2006 04:57:33 AM |
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What's your point? (No pun intended.)
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| User: "Sue..." |
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| Title: Re: Source and absorber independence of free-space light propagation |
15 Nov 2006 05:22:50 AM |
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Chatter Nougat Chew-Chew wrote:
What's your point? (No pun intended.)
It is just a explanation that stands better on its own
that the thread it was used in... so I separated it.
Sue...
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| User: "Chatter Nougat Chew-Chew" |
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| Title: Re: Source and absorber independence of free-space light propagation |
15 Nov 2006 05:32:26 AM |
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Sue... wrote:
Chatter Nougat Chew-Chew wrote:
What's your point? (No pun intended.)
It is just a explanation that stands better on its own
that the thread it was used in... so I separated it.
Sue...
Are you a fan of batique?
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| User: "Sue..." |
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| Title: Re: Source and absorber independence of free-space light propagation |
15 Nov 2006 05:46:45 AM |
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Chatter Nougat Chew-Chew wrote:
Sue... wrote:
Chatter Nougat Chew-Chew wrote:
What's your point? (No pun intended.)
It is just a explanation that stands better on its own
that the thread it was used in... so I separated it.
Sue...
<< Are you a fan of batique? >>
No... axial flow turbjet x 2 , fully shrouded.
Are blind? :o)
Sue...
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