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Multiple choice
Bohr's principle of complementarity, as applied to the double-slit experiment, states that:
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Electrons behave as waves and photons behave as particles, and never the reverse
Interference fringes and which-path information can both be made perfectly sharp at the same time
Wave (interference) behavior and particle (which-path) behavior are mutually exclusive; revealing one fully erases the other
Obtaining which-path information makes the interference fringes sharper and brighter
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