One of Maxwell's equation is Ampere's Law.
Some solutions of it derive E and M waves.
In the equation, the permeability of free space and
the permittivity of free space determine the speed of the wave.
The dielectric and magnetic properties of materials
modify these free space constants, thus the velocity of the wave.
A typical college physics or EM text explain these concepts.
Start with Google.
Tom
Some solutions of it derive E and M waves.
In the equation, the permeability of free space and
the permittivity of free space determine the speed of the wave.
The dielectric and magnetic properties of materials
modify these free space constants, thus the velocity of the wave.
A typical college physics or EM text explain these concepts.
Start with Google.
Tom
Hallo very intersting thread
Greetings i am Klaus Herz PHd
Absorption when transformationen of wave energy from matter
to matter like light waves prism passen only certain waves
could speed up or slow down sorry faster waves blocked
pass slow waves prove matter slow down speed?hmmm?
Absorption dependen to thick mediumen
absorption koefficient of matter
Absorption transformationen slow energy wave speed transformationen
Klaus Herz PHd
Greetings i am Klaus Herz PHd
Absorption when transformationen of wave energy from matter
to matter like light waves prism passen only certain waves
could speed up or slow down sorry faster waves blocked
pass slow waves prove matter slow down speed?hmmm?
Absorption dependen to thick mediumen
absorption koefficient of matter
Absorption transformationen slow energy wave speed transformationen
Klaus Herz PHd
If you're talking transmission of RF through a co-ax type cable, the dielectric affects the speed. Teflon is about .5 X C
We use lossy dielectrics in boards at high frequencies to reduce the length of 1/4W stubs and matching couplers. Typical board specs are .2 X C and .1 X C (Duroid, a type of ceramic loaded board).
We use lossy dielectrics in boards at high frequencies to reduce the length of 1/4W stubs and matching couplers. Typical board specs are .2 X C and .1 X C (Duroid, a type of ceramic loaded board).
Hi,
This links may be of certain help:
1)http://www.phys.hawaii.edu/~teb/java/ntnujava/propagation/propagation.html
2)
http://en.wikipedia.org/wiki/Speed_of_sound
I think the second link gives you good amount of details which is well documented i think
Just refer that.
even if u dont like it
avguy
This links may be of certain help:
1)http://www.phys.hawaii.edu/~teb/java/ntnujava/propagation/propagation.html
2)
http://en.wikipedia.org/wiki/Speed_of_sound
I think the second link gives you good amount of details which is well documented i think
Just refer that.
even if u dont like it
avguy
Actually, c = maximum speed you can accelerate to, given that the force required accelerate mass to C equals infinity. However, nothing is said about things already traveling at or beyond c
I believe the value of interest in this thread is known as EM wave Propagation Velocity, and equals the reciprocal of the square root of the dielectric constant of the material in question. A nice formula to have at hand with this is c = 1/(sqrt (permeability x permittivity of vacuum))
If this is about propagation of signals in conductors, things get a bit more complex. For one, it is often misguidedly thought that electrons travel through conductors quickly. This is actually not true - and has to do with the difference between propagation velocity and drift speed. Think of a conductor as a tube fileld with marbles. Inserting a marble on one end practically imemdiately pushes one marble out the other end, so 'current' is 'near instantaneous'. However, you may wait for a very long time until a PARTICULAR marble pushed in one end, comes out the other end. Propagation would be the first case, drift speed the second. In conductors, drift speeds are only meters per hour (but fo course, this depends on current).
I believe the value of interest in this thread is known as EM wave Propagation Velocity, and equals the reciprocal of the square root of the dielectric constant of the material in question. A nice formula to have at hand with this is c = 1/(sqrt (permeability x permittivity of vacuum))
If this is about propagation of signals in conductors, things get a bit more complex. For one, it is often misguidedly thought that electrons travel through conductors quickly. This is actually not true - and has to do with the difference between propagation velocity and drift speed. Think of a conductor as a tube fileld with marbles. Inserting a marble on one end practically imemdiately pushes one marble out the other end, so 'current' is 'near instantaneous'. However, you may wait for a very long time until a PARTICULAR marble pushed in one end, comes out the other end. Propagation would be the first case, drift speed the second. In conductors, drift speeds are only meters per hour (but fo course, this depends on current).
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