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Download HTPIB27O The Einstein-Bohr Debate
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Transcript
The Einstein-Bohr debate Einstein objected to quantum randomness “God does not play dice” Attacked either Heisenberg uncertainty, or complementarity The Einstein-Bohr debate Einstein would challenge Bohr at conferences Front: Bohr, Heisenberg, Pauli, Stern, Meitner, Ladenburg For example… Gedanken experiment (to disprove complementarity) Electron beam s d •Detect which slit the electron went through with light beam (particle behaviour) •If interference pattern appears, then we have both wave and particle behaviour •Complementarity says it must be either Bohr would take a walk E. Fermi, N. Bohr Bohr’s reply Electron beam s d •No interference pattern would happen •The light that detected the electron would change its momentum •To have interference, electrons must be monochromatic • = h/p •Complementarity is intact Quantum mechanics Bohr always prevailed (God apparently does play dice) Three “types” of physics • Newtonian/classical - big stuff • Relativity - speeds close to c • Quantum mechanics - physics of the atom • Correspondence principle
