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Difficulty: MediumVocabulary-in-Context

Read the passage below:

In his 1913 formulation of atomic structure, Niels Bohr introduced quantum postulates that challenged classical electrodynamics. While classical theory dictated that accelerating electrons must continuously radiate energy and collapse into the nucleus, Bohr asserted that electrons occupy stable, non-radiating stationary states. Critics initially viewed this departure from Maxwellian physics with skepticism, arguing that Bohr's model lacked a physical mechanism to explain why such orbits should be exempt from radiation. To address these concerns and bridge the gap between quantum leaps and classical electrodynamic predictions at macroscopic scales, Bohr articulated the correspondence principle. This theoretical framework did not discard classical electrodynamics entirely; rather, it sought to qualify the domain of classical laws by demonstrating that quantum calculations asymptotically converge with classical predictions in the limit of large quantum numbers. Consequently, classical physics was reinterpreted not as an absolute truth, but as a limiting case valid only within macroscopic boundaries.

In the context of the passage, which of the following best captures the meaning of the word "qualify" as used in the fifth sentence?

  1. A
    certify the competence of
  2. limit the applicability ofAnswer
  3. C
    categorically refute the validity of
  4. D
    unconditionally endorse the principles of
  5. E
    mathematically calculate the parameters of

Answer

The phrase 'limit the applicability of' best captures the meaning of 'qualify' as used in the passage.
In formal academic prose, 'qualify' frequently carries the secondary definition of limiting, modifying, or restricting the scope of a statement or rule. The passage emphasizes that Bohr's principle did not discard classical electrodynamics but restricted its validity to macroscopic scales as a limiting case, making 'limit the applicability of' the correct interpretation.

Step-by-Step Solution

1
Locate the target word in context and examine surrounding structural clues.
The target word appears in the clause: 'did not discard classical electrodynamics entirely; rather, it sought to qualify the domain of classical laws...'
The contrast transition 'rather' indicates that qualifying the domain stands in opposition to discarding the theory entirely.
2
Analyze the explanatory sentence that follows to determine the specific nuance of the word.
The passage explains that classical physics was reinterpreted as a 'limiting case valid only within macroscopic boundaries.'
This shows that Bohr was placing boundaries or restrictions on where classical laws apply.
3
Match the contextual definition with the appropriate option.
'Qualify' in formal academic writing often means to modify, limit, or restrict a claim or scope. Thus, 'limit the applicability of' is the exact equivalent.
This secondary meaning fits the logical flow of the passage.

Key Concept

Secondary Meanings of Words in Academic Context
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Vocabulary-in-Context

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