Hearing Aid Dispenser License Questions
with Verified Correct Answers latest revised
update 2025
Rarefaction --- correct answer ---___________ is when a sound wave
travels, some molecules are less dense and spread farther apart than normal
Pure Tone --- correct answer ---__________ is produced by simple repeated
alternations of compression and rarefaction.
Sine Wave --- correct answer ---_________ is a graphic representation of a
pure tone.
When representing a sine wave on a graph the vertical axis shows
_______1.________ and the horizontal shows _______2._____________. ---
correct answer ---1. amplitude of the wave (power increases amplitude)
2. indicated the time (period)
,Frequency --- correct answer ---_________ is the number of complete
compression/rarefaction cycles per second.
The unit for frequency is.. --- correct answer ---..... Hertz (Hz) or cycles per
second.
Period --- correct answer ---_____________ is the time required for one
complete cycle of compression and rarefaction.
Amplitude --- correct answer ---_________ graphically describes the
intensity of the energy of a vibrating body. It is usually expressed in
decibels (dB)
Intensity is usually expressed in.. --- correct answer ---_____________ is
usually expressed in decibels (dB)
Wavelength --- correct answer ---_________ is the distance between one
wave crest and trough to the next.
,the wavelength of a ___1___ frequency sound is shorter than the wavelength
of a _____2____ frequency sound. --- correct answer ---1. high
2. low
Additional: a high frequency pure tone with a shorter wavelength will have
more cycles tin the same period than a low frequency tone with a long
wavelength.
Phase --- correct answer ---________ is a term used to describe the position
in the cycle of one sound wave relative to another.
At sea level, sound waves travel in the air at about __________ feet per
second or more than 760 miles per hour. --- correct answer ---they travel at
1100 feet per second.
Sound travels faster as the density of the medium increases regardless of
the frequency. Therefore, sound travels about 4x faster through __1___, and
15x faster through ___2____, than through ___3____. --- correct answer ---1.
water 2. steel 3. air
, Resonance --- correct answer ---________ is the natural tendency for an
object to vibrate with greater amplitude at one frequency that at others
when a driving force is applied.
Resonant frequency --- correct answer ---_______________ is the frequency
with the greatest amplitude
Reflection --- correct answer ---_____________ is a characteristic of
environment. flat hard surfaces reflect sound to a greater degree and
uneven or soft surfaces.
Reverberations --- correct answer ---_______________ are sounds that are
reflected from the walls, floor or ceiling of a room. They man persist after
the sound source ceases to vibrate.
Echo --- correct answer ---__________ is a sound reflection heard separately
from the original sound.
with Verified Correct Answers latest revised
update 2025
Rarefaction --- correct answer ---___________ is when a sound wave
travels, some molecules are less dense and spread farther apart than normal
Pure Tone --- correct answer ---__________ is produced by simple repeated
alternations of compression and rarefaction.
Sine Wave --- correct answer ---_________ is a graphic representation of a
pure tone.
When representing a sine wave on a graph the vertical axis shows
_______1.________ and the horizontal shows _______2._____________. ---
correct answer ---1. amplitude of the wave (power increases amplitude)
2. indicated the time (period)
,Frequency --- correct answer ---_________ is the number of complete
compression/rarefaction cycles per second.
The unit for frequency is.. --- correct answer ---..... Hertz (Hz) or cycles per
second.
Period --- correct answer ---_____________ is the time required for one
complete cycle of compression and rarefaction.
Amplitude --- correct answer ---_________ graphically describes the
intensity of the energy of a vibrating body. It is usually expressed in
decibels (dB)
Intensity is usually expressed in.. --- correct answer ---_____________ is
usually expressed in decibels (dB)
Wavelength --- correct answer ---_________ is the distance between one
wave crest and trough to the next.
,the wavelength of a ___1___ frequency sound is shorter than the wavelength
of a _____2____ frequency sound. --- correct answer ---1. high
2. low
Additional: a high frequency pure tone with a shorter wavelength will have
more cycles tin the same period than a low frequency tone with a long
wavelength.
Phase --- correct answer ---________ is a term used to describe the position
in the cycle of one sound wave relative to another.
At sea level, sound waves travel in the air at about __________ feet per
second or more than 760 miles per hour. --- correct answer ---they travel at
1100 feet per second.
Sound travels faster as the density of the medium increases regardless of
the frequency. Therefore, sound travels about 4x faster through __1___, and
15x faster through ___2____, than through ___3____. --- correct answer ---1.
water 2. steel 3. air
, Resonance --- correct answer ---________ is the natural tendency for an
object to vibrate with greater amplitude at one frequency that at others
when a driving force is applied.
Resonant frequency --- correct answer ---_______________ is the frequency
with the greatest amplitude
Reflection --- correct answer ---_____________ is a characteristic of
environment. flat hard surfaces reflect sound to a greater degree and
uneven or soft surfaces.
Reverberations --- correct answer ---_______________ are sounds that are
reflected from the walls, floor or ceiling of a room. They man persist after
the sound source ceases to vibrate.
Echo --- correct answer ---__________ is a sound reflection heard separately
from the original sound.
