- Run the double-slit experiment one photon at a time, but put detectors at both slits so you can measure a photon going through the left slit, the right slit, or both simultaneously.
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- The same as above, but with no detector in the right slit. (If the detector goes off, a photon went through the left slit. If something appears on Wall B but the detector didn't go off, the photon passed through the right slit.)
Write down your answer. Then click here to see the experimental result.
- Repeat the original experiment (no detectors) but emit electrons—still one at a time—instead of light.
Write down your answer. Then click here to see the experimental result.