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Cards In This Set
| Front | Back |
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What is sound?
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A variation in pressure across time
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What is meant by variation?
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Movement of molecules
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Relative to the "normal" distance between molecules, the molecules can be __________ or __________
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Compressed (pushed closer to each other)
rarefied (moved apart) |
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Sine Wave
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Simplest movement
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High air pressure
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Areas of compression
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Low air pressure
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Areas of rarefaction
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Physical properties of sound
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Frequency
Intensity Phase Complexity or Spectral Distribution Envelope Duration |
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Subjective properties of sound
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Pitch
Loudness Attack Decay Timbre Consonance/ Dissonance |
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Frequency
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Number of times per second that a pattern of pressure change repeats in sound waves
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Amplitude of sound wave
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Magnitude of displacement (change) of a sound pressure wave
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What is the average amplitude of a sound wave?
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0
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Intensity of a sound wave
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Amount of sound energy falling on a unit area (related to amplitude)
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What is the frequency range of a young adult with normal hearing?
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 20 to 20,000 Hz |
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How high of a frequency can children hear?
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Probably up to 25k Hz
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Frequency range of middle-aged adults?
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20 - 5,000 Hz
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