Unit 2 · Wave–Particle Duality
Chapter07
The Double-Slit Experiment
One particle at a time, two paths, and the only mystery
Quantum Academy · presented by Dr. Quincy Quantenstein
CH 07X–Y
0:00 / 41:35OpeningTitle
Watch the lesson · Unit 2: Wave–Particle Duality
The Double-Slit Experiment
One particle at a time, two paths, and the only mystery
- ≈ 42 min
- 56 scenes
- Narrated by Dr. Q
- Captions
Generated from the same script as the written lesson, so every word matches the text. Uses your device's voice when it has one; without one, the lesson plays silently with captions. Keys: Space play · ← → scenes · C captions · F full screen.
By the end you'll be able to
- Contrast Feynman's three two-slit experiments, with bullets, water waves and electrons, and explain why electrons fit neither classical picture
- Describe how single-particle experiments, from Bologna in 1974 and Hitachi in 1989 to Nebraska in 2013, built interference patterns one dot at a time
- Calculate fringe spacing with Δy ≈ λL/d for light and for electrons, and predict how it changes with each variable
- Apply the rule 'add the amplitudes, then square' to find bright fringes, dark fringes and fringe visibility, and explain why |ψ₁ + ψ₂|² ≠ |ψ₁|² + |ψ₂|²
- Explain how which-path information, recorded anywhere and read by no one, destroys interference, using Bohr's complementarity and Englert's relation D² + V² ≤ 1
- Explain what quantum eraser and delayed-choice experiments actually show, and why they neither change the past nor send signals