> 10GHz, light travels approximately 3cm between each period of the clock
Light doesn't change speed, so this statement confuses me.
Light doesn't change speed, so this statement confuses me.
Practically speaking, it does change speed. The speed of light in a vacuum is fixed, but it varies based on what it's traveling through.
The propagation velocity of an EM signal in RG coax cable is 80% of c*, PCB traces can be as low as 50% and somewhat surprisingly both fiber optic cable and cat6 cable are about the same, ~60-70%. I don't know if there is any good public information about the velocity factor with modern CPU transmission lines.