Term
| Incidence of hearing loss |
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Definition
about 120 million worldwide
almost 1 in 10 individuals in US
40% of the people are younger than 65 |
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Term
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Definition
| sound starts as vibration of a source. Vibrations travel in waves and the waves move through a medium and repeat in cycles of Compression and Rarefaction |
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Term
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Definition
| Simple harmonic motion. Sound waves oscillate and can be described as a periodic disturbance propagated through an elastic medium. |
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Term
| displacement in wave motion |
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Definition
| direction of vibration of the medium. amplitude & direction. |
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Term
| propagation in wave motion |
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Definition
| relative to the direction in which the wave is moving |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| rate of a wave vibration. Cyclas per second. frequency = 1/period. also measured in Hertz. Humans can generally hear 20-20,000 Hz. 125-6,000 Hz most important for speech. Frequency is perceived as pitch. |
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Term
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Definition
| amplitude or strength of the sound vibration. measured in decibels (dB) but 0 dB does NOT indicate the absence of sound. Intensity is perceived as loudness. |
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Term
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Definition
| time it takes to complete one cycle |
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Term
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Definition
| distance traveled in one cycle |
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