Comparing sound waves to waves in a Coaxial Cable aka T.E.M.

heymistergq
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Homework Statement



Compare sound waves to waves in coaxial cables a.k.a. T.E.M.

I really have no idea how to answer this question. I've been researching and researching, and so far i can't find any information about WAVES for coaxial cables. Any help?

Thanks.


Homework Equations





The Attempt at a Solution



:eek:
 
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Let's start with:

What does the "T" in "TEM" stand for? For that matter, the "EM" is another difference.
 
turin said:
Let's start with:

What does the "T" in "TEM" stand for? For that matter, the "EM" is another difference.

The T means Transverse am i correct?
 
heymistergq said:
The T means Transverse am i correct?
Yes. Can you think of a reason why this is different than a sound wave? Well, actually, that is a little bit more complicated, but I don't want to confuse you. Let's just assume sound in a fluid, like air.
 
turin said:
Yes. Can you think of a reason why this is different than a sound wave? Well, actually, that is a little bit more complicated, but I don't want to confuse you. Let's just assume sound in a fluid, like air.

I know that air is trapped between the inner and outer conductor, but what i don't know is how their waves are different... I might not be descriptive enough, let me know if I am not.
 
heymistergq said:
I know that air is trapped between the inner and outer conductor, ...
No, it's not. (at least, not for a good quality one.) Probably, they are asking about a sound wave in the air (not in the coax), and then to compare this to the kinds of wave in a coax that are TEM.
 
To solve this, I first used the units to work out that a= m* a/m, i.e. t=z/λ. This would allow you to determine the time duration within an interval section by section and then add this to the previous ones to obtain the age of the respective layer. However, this would require a constant thickness per year for each interval. However, since this is most likely not the case, my next consideration was that the age must be the integral of a 1/λ(z) function, which I cannot model.
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