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Difficulty: EasyInferences from the Text

Acoustic studies of ancient open-air theatres, most notably the theatre at Epidaurus, have demonstrated how structural arrangement and material choice interact to enhance vocal transmission without artificial amplification. While earlier accounts attributed the site's vocal clarity solely to prevailing wind currents or the slope of the surrounding hillside, modern acoustic profiling indicates that the tiered rows of fluted limestone seats function as passive acoustic filters. These stone surfaces attenuate low-frequency background noise—such as the rustling of nearby foliage and audience murmurs—while reflecting and preserving higher-frequency sounds characteristic of human speech. As a result, the acoustic energy of an actor's voice carries across considerable distances, whereas ambient environmental sounds below 500 Hertz are substantially diminished.

Based on the passage, which of the following statements can be logically inferred? (Select all that apply.)

  1. Low-frequency ambient sounds undergo greater suppression by the theatre's limestone seating than do high-frequency speech sounds.Answer
  2. B
    The original architects of Epidaurus possessed formal mathematical models of sound waves below 500 Hertz when constructing the seating tiers.
  3. Wind currents and terrain slope do not constitute the complete explanation for the vocal clarity observed at Epidaurus.Answer
  4. D
    Outdoor amphitheatres lacking limestone rows are completely unable to project human vocal frequencies over long distances.
  5. E
    Modern indoor auditoriums rely on fluted stone seating rather than electronic systems to manage background audience noise.

Answer

The supported inferences are that low-frequency ambient sounds undergo greater suppression by the limestone seating than higher-frequency speech sounds, and that wind currents and terrain slope do not constitute the complete explanation for the vocal clarity observed at Epidaurus.
The passage explicitly describes the tiered limestone seats as filtering low-frequency ambient sounds while preserving higher-frequency vocal sounds, supporting the comparative filtering inference. Furthermore, by introducing material filtering as an active factor alongside earlier hypotheses that credited wind or slope solely, the passage entails that wind and slope alone do not account for the phenomenon.

Step-by-Step Solution

1
Analyze stated information regarding sound frequency filtering.
The text confirms that limestone seating suppresses low-frequency ambient noise while reflecting higher-frequency speech sounds.
This establishes a direct comparative relationship between the attenuation of low-frequency and high-frequency sound waves.
2
Evaluate earlier theories versus modern acoustic findings.
Earlier theories attributed clarity solely to wind and hillside slope, but modern research demonstrates a significant structural contribution from the seating.
The existence of an additional significant factor logically disproves that wind and slope are the sole explanations.
3
Assess remaining options for unsupported leaps or extraneous claims.
Claims regarding the ancient architects' theoretical knowledge, absolute limitations of other materials, and modern auditorium design are unaddressed by the text.
Valid reading comprehension inferences must strictly derive from the text without extrapolating unstated premises.

Key Concept

Drawing deductive inferences from contrasting textual claims and qualifying scope modifiers
Estimated Time:1m 0s
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Inferences from the Text

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