Question

the double - slit experiment is a famous experiment that reveals the wave - particle duality of light and matter. when particles such as electrons are fired through two closely spaced slits, they create an interference pattern on a detection screen, indicative of wave behavior, but if one attempts to observe which slit the electron passes through, the interference pattern collapses, and the electrons behave like particles. this phenomenon, known as wave - function collapse, initially shocked the world due to its implications for our understanding of quantum mechanics—scientists explain that unlike macro - level interactions, the act of measurement itself alters the system, suggesting that ______
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which choice most logically completes the text?
a the interference pattern can be restored by removing the detection apparatus.
b the wave - function collapse is a common but avoidable consequence of measurement.
c at the quantum level, there may not be a truly neutral observer.
d the electrons behavior is determined solely by the experimental setup.

Explanation:

The text states that measuring (observing) the quantum system alters its behavior (collapsing the wave function and changing electron behavior from wave-like to particle-like). This directly supports the idea that an observer cannot be "neutral" (uninvolved) at the quantum level, as their act of measurement impacts the system. Option A is irrelevant, as the text does not mention restoring the pattern by removing detection. Option B contradicts the text, which frames wave-function collapse as a consequence of measurement, not an avoidable one. Option D is incorrect, as the text shows behavior changes based on observation, not just the experimental setup.

Answer:

C. at the quantum level, there may not be a truly neutral observer.