In one experiment, a photon entered one detector and that detector then indicated the slit through which a second photon passed in a double-slit experiment that was some distance away from the first detector. This experiment shows that
A) macroscopic detectors always exert actual forces on microscopic particles, even at a distance.
B) it is possible for a detector to obtain complete information about a particle's simultaneous position and velocity, without causing a sudden change in the EM field.
C) whenever a detector exerts an actual force on a particle, it causes the particles EM field to suddenly change.
D) microscopic events are subject to Heisenberg's uncertainty principle whenever detectors are involved.
E) macroscopic detectors can have non-local effects even on objects that they do not directly interact with.
Question 2
If we describe the double-slit experiment entirely in terms of electrons instead of in terms of fields, then which of the following is the best description of what one individual electron does in this experiment?
A) It goes through both slits.
B) It goes through either one or the other slit, but the observer does not know which one it actually goes through.
C) It doesn't go through the slits at all.
D) It turns into the tooth fairy.
E) It goes through either one or the other slit, and the observer does know which one it actually goes through.
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