Physics
Wave-Particle Duality
Quick fact
In experiments, light behaves as a wave when passing through slits or reflecting off surfaces, but acts as a particle when interacting with matter in specific ways.
Why this is interesting
Did you know that light can act like both a wave and a particle? This strange duality is at the heart of how we understand the universe on the smallest scale.
Read the full explanation
Understanding Wave-Particle Duality
Imagine you're watching ripples spread out from a stone dropped into water — that's like waves. Now imagine the stone itself — it's a single object, which is more like a particle. In quantum physics, particles like light and electrons can act like both these things at different times, depending on how we observe them.
A deeper explanation
Wave-particle duality shows that fundamental entities such as photons (particles of light) and electrons do not have a single, fixed nature. Instead, they display properties of both waves and particles based on the experimental setup. For example, in experiments like the double-slit test, these particles create wave-like interference patterns when unobserved but behave like discrete particles when measured. This duality is central to quantum mechanics and helps explain phenomena such as diffraction, interference, and quantized energy levels.