CSD 230 Exam 1

Question 1

Acoustics

Answer 1

Science of sound

Question 2

Amplitude

Answer 2

Amount of vibration of a mass from the position of rest the farthest point from
the position of rest (up and down on chart)

Question 3

Condensation

Answer 3

Region of a sound wave characterized by an increased density of molecules

Opposite of rarefaction

Question 4

Damping

Answer 4

Decrease in the amplitude of a vibrating body over time

Question 5

Decibel (dB)

Answer 5

Unit of sound intensity level

The logarithm of the pressure of a sound to a reference pressure (usually
0.0002 dynes/cm2)

Question 6

Frequency

Answer 6

Number of complete cycles (or oscillations) of a vibrating body in a specified unit of time

Hertz (Hz)

Question 7

Intensity

Answer 7

Magnitude of sound energy per unit area

Similar to volume
Force of a sound wave

Question 8

Pitch

Answer 8

The psychological perception of frequency

Question 9

Pure Tone

Answer 9

Single-frequency tonal sound

Aka a sinusoid

Question 10

Refraction

Answer 10

Region of a sound wave characterized by an area of less dense molecules

Opposite of condensation

Question 11

Resonance

Answer 11

Natural rate of vibration of a mass

Shatter a glass with a musical tone

Question 12

Sound

Answer 12

Vibration through a medium (air/liquid)

Question 13

Primary sections of the ear

Answer 13

outer, middle, inner, retrocochlear

Question 14

Peripheral

Central

Answer 14

Outer ear
* Middle ear
* Inner ear
* CN (8)
* Cochlear nucleus on the brainstem

• Rest of the brainstem
• Cortex

Question 15

Hearing Threshold

Answer 15

Softest intensity at which one can hear a sound
Frequency dependent

Question 16

Pinna effect

Answer 16

loudness and intensity differences for localization

Question 17

a-

Answer 17

on, in, at

Question 18

genesis

Answer 18

origin/creation

Question 19

cephal

Answer 19

head

Question 20

dys

Answer 20

bad

Question 21

-pathy

Answer 21

disorder

Question 22

oto

Answer 22

ear

Question 23

media

Answer 23

middle

Question 24

-rreha

Answer 24

drainage

Question 25

4th week of gestation

Answer 25

Ossicles start to develop
External gill groove starts to form
Start to see vestibular system

Question 26

38th Day of
Gestation

Answer 26

Differentiation of otic vesicle yields 3 major
subdivisions of the inner ear
* Endolymphatic sac
* Endolymphatic duct
* Utricular and saccular portions of the inner
ear

Question 27

Fifth to Sixth Week of Gestation

Answer 27

External ear begins to form
* Start to see the EAC
* External ears form from 6 thickenings
* “axon hillocks”
* Nasopharynx develops
* Upper lip develops
* Beginning of the semicircular canals
* 6th week

Question 28

7th Week of
Gestation

Answer 28

First full turn of the cochlea develops
Vestibular system is fairly developed
* Outer ear is visible

Question 29

9th week of gestation

Answer 29

2 ¼ turns of the cochlea and semi-circular
canal system are developed.
Ear is more upright and more forward on the
head.

Question 30

3rd month

Answer 30

Ossicles are formed, but still in fluid
A meatal plug forms at the bottom of the pharyngeal cleft.

Question 31

The cochlea is adult-like by _____ weeks of gestation, while the middle ear
continues to develop until the end of gestation.

Answer 31

25th