The Einstein-Bohr debate

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Presentation 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) 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 s d Electron beam

Bohr would take a walk E. Fermi, N. Bohr

Bohr’s reply 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 s d Electron beam

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

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