| Outer Ear |
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| • | Auditory
canal 2.5 cm long, 7 mm wide |
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| • | “directional
microphone” |
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| • | Resonant
frequency ~ 3000 Hz |
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| • | Displacement
of tympanic membrane: |
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| 10-3
… 10-8 mm |
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|
diameter of
H-atom: 10-8 mm |
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