A problem listed for a given section requires an understanding of that section and earlier sections, but not of later sections. Within each section, problems are listed in approximate order of difficulty. A single dot (•) indicates straightforward problems involving just one main concept and sometimes requiring no more than substitution of numbers in the appropriate formula. Two dots (••) identify problems that are slightly more challenging and usually involve more than one concept. Three dots (•••) indicate problems that are distinctly more challenging, either because they are intrinsically difficult or involve lengthy calculations. Needless to say, these distinctions are hard to draw and are only approximate.
•• A classical physicist is determined to find out which slit each electron passes through in the two-slit experiment (without disrupting the interference pattern). To this end, he places a molecule near one slit in the hope that electrons passing through this slit will excite the molecule, causing it to give out a characteristic pulse of light. Show that this arrangement fares no better than the thought experiment using light that was described in Section 6.5.
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