Before it's observed, it's not halfway between states, but is instead a "superposition" of the two at once. In quantum physics, the state of a particle is described by a wave equation, which tells ...

Quantum superposition is a phenomenon in which a tiny particle can be in two states at the same time — but only if it is not being directly observed.

Standing waves are one of those topics that lots of people have a working knowledge of, but few seem to really grasp. A Ham radio operator will tell you all about the standing wave ratio (SWR ...