This fun paper describes the travails of trying to create a quantum mechanics concept inventory (a test focused on conceptual understanding): journals.aps.org/prper/pdf/10.1
e.g. D is "obviously" the answer to me, but it privileges a matter wave interpretation, so some profs say E…
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Incidentally, only 64% of undergrads at University of Colorado were able to answer that one correctly after finishing their modern physics course—yikes! (E, the alternative answer you might favor, only garnered 5%… most wrong answers were B or C)
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I tried to look this up by referencing the experiments where they tried to verify behavior based on single photons only and am more confused than ever now
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I love that!!
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