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12 Cards in this Set
- Front
- Back
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Properties |
Frequency Amplitude Wavelength Velocity |
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Frequency |
-Relates to the speed of sound and determines its pitch. -it is measured by Hertz (Hz). -Frequency (Hz)= Speed of Sound(ft/sec) ÷ Wavelength (ft) |
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Amplitude |
-relates to the size of sound waves and determines the "loudness of sound". -measured in N/m² |
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Threshold of Human hearing |
- 0.00002 N/m² or 0.0 dBA - minimum threshold of human hearing - 65 dBA- normal speaking voice - 120 dBA- rock concert - 85 dBA↑- prolonged exposure to this is considered to cause permanent damage to human ears |
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Wavelength |
- Distance travelled by a sound wave per one (1) complete cycle or period -Wavelength (ft)= Speed of Sound (ft/sec) ÷ Frquency (Hz) |
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Velocity |
Speed of sound ( ft/sec) |
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Inverse Square Law |
The energy twice as far from the source is spread over four times the area, hence one fourth the intensity |
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Infrasonic |
- Low frequency sound - lower than ↓20.0 Hz= "normal" limit of human hearing |
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Ultrasonic |
- High frequency sound - beyond ↑20,000 Hz= threshold of human hearing |
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Attenuation ( sound ) |
Gradual loss or diminishing of all practical sound waves / energy |
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Loudness |
Subjective term to describe the strength of the ear's perception of sound |
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Noise |
Unwanted sound |
