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Intro to Quantum Mechanics(phys 304)
•Instructor: Prof. Marcel Franz•Textbook: “Introduction to QM” by D.J. Griffiths (second edition)•Lectures: Tu & Th, 9:30-11:15•Course webpage: www.physics.ubc.ca/~franz/phy304.html
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Particle-wave duality
What is this?
Young’s “double-slit” experiment
Interference: Light consists of WAWES
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If light consisted of particles…
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Light interference
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r2 − r1 ≈ d sinθPath difference:
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d sinθ = mλ , m = 0,±1,±2,...
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d sinθ = (m + 12)λ , m = 0,±1,±2,...
Intensity maxima:
Intensity minima:
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Now perform the same experiment with electrons
Experiment by A. Tonomura of Hitachi Corp., June 1999
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Electrons: particles or waves?
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http://www.hqrd.hitachi.co.jp/em/doubleslit.cfm
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What can we conclude about the electron from
Tonomura experiment?
Electrons appear to have both particle-like and wave-like properties!