the ear
- Created by: Emilyburkee
- Created on: 29-04-21 10:34
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- the physics of the ear
- the outer ear
- externa auditory meatus
- typanic membrane
- pinna
- cerumious glands
- the middle ear
- typpanic cavity
- auditory ossicles - 3 small bones
- hammer connects ear drum and anvil
- round window
- function = to amplify sound waves
- bones rock and transfer energy via cavity
- amplitude x1.5
- large area diff ear drum vs oval window
- increases pressure x 15
- p of sound waves = x 20
- bones rock and transfer energy via cavity
- inner ear
- balance organs detect orientation and velocity chnages
- cochlea- helical 3 membrane channels
- 3rd = 25,000 hairs corti
- tympanic - fluid filled
- hearing
- sound exists as pressure waves in air
- p waves cause ear drum to vibrate
- ear drum vibration = ossicles vibrate and the to oval window
- pressure waves are produced in cochleas fluid and travel up vestibular channel
- vibrations cause displacemnts in basilar membrane causing action in cilia - nervious activity
- higher f act at base of cochlea, higher f act at apex
- log responses
- intesnity
- threshold i = minimum i that humans can hear
- perceived loudness is not linear- log relationship
- relative I = LOG10= I1/I0
- BEL
- intesnity
- sensitivity
- hearing deteriorates at a faster rate when exposed to loud sounds
- 2-5 khz = most sensitive range
- imbalance of sensitivity = dont hear joints moving ect
- 30db required to detect 100hz
- hearing deteriorates at a faster rate when exposed to loud sounds
- the outer ear
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