Chapter 4 Section 3

Question 1

properties of south waves

Answer 1

frequency/wavelength is pitch, amplitude is loudness/intensity

Question 2

decibel

Answer 2

unit of relative loudness of sound wave. 60dB is 1000x as loud as 30dB

Question 3

pinna

Answer 3

external and visible part of ear, funnels sound waves to eardrum

Question 4

tympanic membrane

Answer 4

eardrum, vibrates with the waves

Question 5

cochlea

Answer 5

a snail-shaped liquid-filled tube in the inner ear. liquid moving moves hair cells, which trigger

Question 6

oval window

Answer 6

the membrane covering the opening of the cochlea. vibrates, disturbing cochlea fluid.

Question 7

cilia

Answer 7

16,000 hair cells all have bundle of fibers at tip. sensitive to one atom

Question 8

frequency theory of hearing

Answer 8

whatever the pitch of a sound wave, nerve impulses of a corresponding frequency will be sent to the auditory nerve. For example, 600hz sound=600 nerve impulses per second.

Question 9

place theory of hearing

Answer 9

different areas of the cochlea respond to different frequencies

Question 10

conductive hearing loss

Answer 10

caused by physical damage to the ear that reduce ability to transfer vibrations

Question 11

sensorineural hearing loss

Answer 11

caused by damage to cilia or the auditory nerve (less common but occurs with age)

Question 12

tinnitus

Answer 12

a ringing or buzzing sensation

Question 13

cochlear implant

Answer 13

series of electrodes placed inside the cochlea