Waveparticle duality explains particle behavior from "summary" of The Quantum Universe by Brian Cox,Jeff Forshaw
The idea that particles can behave like waves is a fundamental concept in quantum mechanics. This wave-particle duality means that particles such as electrons can exhibit both wave-like and particle-like behaviors depending on how they are observed. This duality was first proposed by the physicist Louis de Broglie in 1924, and it has since become a cornerstone of quantum theory. When we observe the behavior of particles on a small scale, such as electrons passing through a double-slit experiment, we see interference patterns that are characteristic of waves. This phenomenon cannot be explained by classical physics, which treats particles as discrete entities with definite positions and velocities. Instead, quantum mechanics tells us that particles can exist in a superposition of states, behaving like waves until they are measured and collapse into a single state....
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