The velocity of a transmission line is less than air so we have to take the dielectric and its thickness into consideration. For now just be aware a 3cm wavelength signal may see a 2cm path in your wiring as a wavelength.
The velocity for some common coax. So why would a radio engineer want to know these things?
Here is an example. Notice the 1/12 wave line being two different cable would not be the same length. The cable must be adjusted to suite the velocity factor.
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