CMU CSD 331 FINAL EXAM ACTUAL
QUESTIONS AND CORRECT ANSWERS
Otolaryngologist - CORRECT ANSWERS medical doctor who studies diseases of the ear,
nose, and throat
Neurotologist - CORRECT ANSWERS medical doctor (ENT); more specialized, disorder
of the ear, auditory nerve, and brain
Audiologist - CORRECT ANSWERS advance degrees studying hearing and hearing
related disorders
Hearing Aid Dispenser - CORRECT ANSWERS basic training in fitting and selling
hearing aids
When did Audiology start? - CORRECT ANSWERS interest gained after WWII
Why did Audiology start? - CORRECT ANSWERS service men coming home from
WWII with hearing loss from noise
Raymond Carhart - CORRECT ANSWERS "father of audiology" coined the term
audiology in 1945
Georg von Bekesy - CORRECT ANSWERS won the Nobel peace prize in 1961 for
discovering how the cochlea responds to sound (physiology of medicine)
,James Jerger - CORRECT ANSWERS founding member of AAA, developed many test
and rehab procedures, worked under Carhart, author/coauthor of over 300 publications
Marion Downs - CORRECT ANSWERS champion of pediatric audiology, led the
movement for universal newborn hearing screening
What is the difference between the physical event of sound and the psychological phenomenon
of a sound? - CORRECT ANSWERS physical events include movement and vibration,
while psychological is how we perceive sound
Example of physical event - CORRECT ANSWERS frequency, amplitude, phase (wave)
Example of psychological phenomenon - CORRECT ANSWERS pitch, loudness, quality
How do we define one cycle of a wave - CORRECT ANSWERS start point to the next
start point
frequency - CORRECT ANSWERS number of cycles person second (Hz)
period - CORRECT ANSWERS the amount of time it takes to complete one cycle
1/frequency
Amplitude - CORRECT ANSWERS the magnitude or strength of a sound
phase - CORRECT ANSWERS stage of the cycle at any given pint in time
, in phase - CORRECT ANSWERS could be laid over top of one another and match
perfectly
out of phase - CORRECT ANSWERS start and stop in different points; would not match
up
What is sound intensity? - CORRECT ANSWERS indicate how much sound power is
transferred from the sound source to the surrounding area
what is sound pressure? - CORRECT ANSWERS indicate how much compressed or
rarefied the particle are
What happens when sound pressure doubles? - CORRECT ANSWERS increase by 6 dB
What happens when sound pressure increases 10x? - CORRECT ANSWERS increase by
20 dB
What happens when sound intensity doubles? - CORRECT ANSWERS increases by 3 dB
What happens when sound intensity increases 10x? - CORRECT ANSWERS increases by
10 dB
Why do we use dB HL? - CORRECT ANSWERS to make all sounds what average ears
can hear; used for hearing tests
How do you covert between dbSPL and dB HL? - CORRECT ANSWERS dB HL= dB
SPL - reference point
QUESTIONS AND CORRECT ANSWERS
Otolaryngologist - CORRECT ANSWERS medical doctor who studies diseases of the ear,
nose, and throat
Neurotologist - CORRECT ANSWERS medical doctor (ENT); more specialized, disorder
of the ear, auditory nerve, and brain
Audiologist - CORRECT ANSWERS advance degrees studying hearing and hearing
related disorders
Hearing Aid Dispenser - CORRECT ANSWERS basic training in fitting and selling
hearing aids
When did Audiology start? - CORRECT ANSWERS interest gained after WWII
Why did Audiology start? - CORRECT ANSWERS service men coming home from
WWII with hearing loss from noise
Raymond Carhart - CORRECT ANSWERS "father of audiology" coined the term
audiology in 1945
Georg von Bekesy - CORRECT ANSWERS won the Nobel peace prize in 1961 for
discovering how the cochlea responds to sound (physiology of medicine)
,James Jerger - CORRECT ANSWERS founding member of AAA, developed many test
and rehab procedures, worked under Carhart, author/coauthor of over 300 publications
Marion Downs - CORRECT ANSWERS champion of pediatric audiology, led the
movement for universal newborn hearing screening
What is the difference between the physical event of sound and the psychological phenomenon
of a sound? - CORRECT ANSWERS physical events include movement and vibration,
while psychological is how we perceive sound
Example of physical event - CORRECT ANSWERS frequency, amplitude, phase (wave)
Example of psychological phenomenon - CORRECT ANSWERS pitch, loudness, quality
How do we define one cycle of a wave - CORRECT ANSWERS start point to the next
start point
frequency - CORRECT ANSWERS number of cycles person second (Hz)
period - CORRECT ANSWERS the amount of time it takes to complete one cycle
1/frequency
Amplitude - CORRECT ANSWERS the magnitude or strength of a sound
phase - CORRECT ANSWERS stage of the cycle at any given pint in time
, in phase - CORRECT ANSWERS could be laid over top of one another and match
perfectly
out of phase - CORRECT ANSWERS start and stop in different points; would not match
up
What is sound intensity? - CORRECT ANSWERS indicate how much sound power is
transferred from the sound source to the surrounding area
what is sound pressure? - CORRECT ANSWERS indicate how much compressed or
rarefied the particle are
What happens when sound pressure doubles? - CORRECT ANSWERS increase by 6 dB
What happens when sound pressure increases 10x? - CORRECT ANSWERS increase by
20 dB
What happens when sound intensity doubles? - CORRECT ANSWERS increases by 3 dB
What happens when sound intensity increases 10x? - CORRECT ANSWERS increases by
10 dB
Why do we use dB HL? - CORRECT ANSWERS to make all sounds what average ears
can hear; used for hearing tests
How do you covert between dbSPL and dB HL? - CORRECT ANSWERS dB HL= dB
SPL - reference point
