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