The wave-like behavior of electrons, as demonstrated in the double-slit experiment, supports the idea that electrons can exhibit both wave and particle characteristics simultaneously.

When many electrons are fired one at a time through two closely spaced slits, the pattern that builds up on a screen shows bright and dark bands, just like light waves interfere. This shows that each electron can pass through both slits at once and act as a spreading wave, creating the interference pattern. However, when a detector is placed to see which slit an electron goes through, the electron behaves like a single particle, landing at a definite point on the screen. The fact that the same electron can produce a wave‑like interference pattern and also be counted as a single hit demonstrates that electrons possess both wave and particle traits at the same time. A simple example is shooting electrons at a double‑slit apparatus and watching the interference pattern appear, then adding a detector that collapses the wave to a single spot, confirming the dual nature.