CAOHC EXAM STUDYGUIDE
Decibel (dB)
Unit of measurement for intensity/loudness
Hertz (Hz)
Unit of measurement for frequency/pitch
Frequency range for humans at birth
20 Hz to 20,000 Hz
Frequency range for human speech
250 Hz to 4,000 Hz
Frequency range humans hear BEST
500 Hz to 4,000 Hz
Range of human intensity
0 dB to 140 dB
Range of intensity for normal hearing
0 dB HL to 25 dB HL
Conductive Hearing Loss
Hearing loss or impairment resulting from interference with
the transmission of sound waves to the cochlea
Sensorineural hearing loss (nerve deafness)
Hearing loss caused by damage to the cochlea's receptor
cells or to the auditory nerves
Mixed hearing loss
Combination of conductive and sensorineural types in
same ear
Temporary Threshold Shift (TTS)
A reversible desensitization in hearing that is perceived to
disappear after removal from hazardous noise
Part of the outer ear that collects sound waves
, Pinna
Part of the middle ear that equalizes the ear to
atmospheric pressure
Eustachian Tube
Impacted cerumen is an example of this type of
hearing loss:
Conductive
Noise induced hearing loss (NIHL) is an example of
this type of hearing loss:
Sensorineural
Term for aging of the ear which results in a
sensorineural hearing loss
Presbycusis
Mission of CAOHC
Promote hearing loss prevention by enhancing the quality
of occupational practices
CAOHC certification period
5 years
High blood pressure is an example of this type of
effect from hazardous noise exposure
Non-auditory effects
Tinnitus and noise-induced hearing loss are example
of this type of effect from hazardous noise exposure
Auditory effects
Typical notch occurs at this frequency for noise-
induced hearing loss
4000 Hz
Damage to hearing is a function of the _________ and
_________ of the sound
intensity; duration
Decibel (dB)
Unit of measurement for intensity/loudness
Hertz (Hz)
Unit of measurement for frequency/pitch
Frequency range for humans at birth
20 Hz to 20,000 Hz
Frequency range for human speech
250 Hz to 4,000 Hz
Frequency range humans hear BEST
500 Hz to 4,000 Hz
Range of human intensity
0 dB to 140 dB
Range of intensity for normal hearing
0 dB HL to 25 dB HL
Conductive Hearing Loss
Hearing loss or impairment resulting from interference with
the transmission of sound waves to the cochlea
Sensorineural hearing loss (nerve deafness)
Hearing loss caused by damage to the cochlea's receptor
cells or to the auditory nerves
Mixed hearing loss
Combination of conductive and sensorineural types in
same ear
Temporary Threshold Shift (TTS)
A reversible desensitization in hearing that is perceived to
disappear after removal from hazardous noise
Part of the outer ear that collects sound waves
, Pinna
Part of the middle ear that equalizes the ear to
atmospheric pressure
Eustachian Tube
Impacted cerumen is an example of this type of
hearing loss:
Conductive
Noise induced hearing loss (NIHL) is an example of
this type of hearing loss:
Sensorineural
Term for aging of the ear which results in a
sensorineural hearing loss
Presbycusis
Mission of CAOHC
Promote hearing loss prevention by enhancing the quality
of occupational practices
CAOHC certification period
5 years
High blood pressure is an example of this type of
effect from hazardous noise exposure
Non-auditory effects
Tinnitus and noise-induced hearing loss are example
of this type of effect from hazardous noise exposure
Auditory effects
Typical notch occurs at this frequency for noise-
induced hearing loss
4000 Hz
Damage to hearing is a function of the _________ and
_________ of the sound
intensity; duration
