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SUThe visual shows particles (like electrons or photons) being fired at a barrier with two slits. Instead of forming two simple piles behind the slits, they build up a “stripy” pattern on the back screen, known as an interference pattern.
Wave Behavior: When not “observed,” these particles travel like waves. A single particle can pass through both slits simultaneously and interfere with itself, creating peaks and valleys of probability.
The Build-Up: Even though the particles are detected one by one as discrete dots (particle behavior), their final distribution reflects the wave interference pattern.
The Observer Effect: If a detector is placed at the slits to see which path the particle took, the interference pattern disappears. The act of observation “collapses” the wave-like state, forcing the particle to choose one slit and behave like a classical marble, forming just two distinct piles.
Why It’s Famous
This experiment, first performed with light by Thomas Young in 1801 and later with matter like electrons, fundamentally changed our understanding of reality. It proves that at the quantum level, everything has properties of both waves and particles.
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