Why computer clocks hardly goes above ~5GHz?

[mgb_phys]

It means you can go 2.5 times the speed of light in a diamond.
This does happen - the blue glow from a reactor is due to particles traveling faster than light in water (n=1.33). The limit is only c=speed of light vacuum

 

[Lancelot59]

Ah, ok. I only have a basic understanding of relativity from Grade 11 Physics. :/

 

[Redbelly98]

Ok besides a pencil, just a solid object. Does energy have to obey the light speed limit?

In any solid object, the "push" is a pressure wave, and propagates from one end to the other at the speed of sound for that object's material.

 

[Lancelot59]

That makes sense.