How do reflections work, physically to the charge carriers level?
Considering a square wave generator connected to a long, open cable, I've made a quick chronological diagram of the propagation of the generator voltage, but I can't explain how electrons and holes bounce off the open end. For light (so… coax cables?) and sound it sort of makes sense to reflect when there is a sudden change in impedance, but here…
Based on those diagrams, the generator should start producing a higher voltage when the line is "full" (can't push any more electrons in), therefore after a single delay; however it does that after a return delay right? Does it "push" electrons in until there is an open voltage across it? How should that diagram be modified so that it is accurate?
The diagram is helping me to understand the "how" of this video.