Stand Sometimes the best way to prove an equation is to “bring it to life” through demonstration. This particular demonstration serves three purposes. It helps teach about standing waves and wavelength, and it shows why pure tones cannot be used to test hearing thresholds in a sound-field environment. In this ... Article
Article  |   October 01, 2001
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Author Affiliations & Notes
  • Honor O’Malley
    Teachers College, Columbia University, New York, NY
Article Information
Articles
Article   |   October 01, 2001
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SIG 6 Perspectives on Hearing and Hearing Disorders: Research and Diagnostics, October 2001, Vol. 5, 9. doi:10.1044/hhd5.1.9
SIG 6 Perspectives on Hearing and Hearing Disorders: Research and Diagnostics, October 2001, Vol. 5, 9. doi:10.1044/hhd5.1.9
Sometimes the best way to prove an equation is to “bring it to life” through demonstration. This particular demonstration serves three purposes. It helps teach about standing waves and wavelength, and it shows why pure tones cannot be used to test hearing thresholds in a sound-field environment.
In this demonstration, the intention is to create a standing wave. The equipment includes an audiometer, an audiometric sound treated room, and two loud speakers arranged for sound-field testing.
A standing wave can occur when an incident wave encounters its reflection. Consider a pure tone of a given low frequency. The term standing wave can be misinterpreted. The molecules that were set into vibration continue to be in motion. What is unchanging is the pattern of interaction between the incident and reflected waves. This pattern, which represents constructive interference (the node) and destructive interference (the antinode), is the standing wave.
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