Hearing loss is never permanent .
to any noise above 85 decibels can cause gradual hearing
Hearing loss is a disease that only affects older
A head injury can cause hearing
Prolonged use of certain chemicals and drugs can cause
Earplugs should be worn in areas with excessive noise.
Cotton swabs, such as Q-tips, should be used to clean
the ear canal after
If exposure to a sound is not causing pain then it
isn’t too loud.
Ringing in the ears is a sign of exposure to excessive
Answers: 1-F, 2-T, 3-F,
4-T, 5-T, 6-T, 7-F, 8-F, 9-T
What You Need:
A ticking watch or clock
Measuring tape or meter stick
Test your ability to locate an object using only your
Blindfold your subject and occlude one ear by having
them insert a foam
Take a watch or clock that ticks and
approach the subject from various angles.
Record the distance at which the subject can detect the
Repeat the same experiment with the subject’s other ear
occluded and then with
both ears opened.
What did you observe?
What was the average distance
for the different ears?
Compare the average distances for both ears vs.
In general, the farther away
that you are able to detect the ticking noise, the more
sensitive your ears are to sound.
The average distance will vary from person to
person depending on personal exposure, family history,
and age. The average distance should be similar for both
ears; however, distances will not be exactly the same as
no two ears are exactly the same.
You all know the old saying ‘two heads are better
than one”; well this also applies for ears! Having two
functioning ears is important to our hearing; therefore,
the average distance at which you can detect the ticking
should be greater when you use both ears.
A sound level meter (ask your teacher for one).
A MP3 player or discman with
headphones and your favourite music.
Access to a noisy area, such as a busy cafeteria
How to use the
sound level meter
have set the MP3 player to the listening level corresponding
to each situation, attach the sound level meter to the
headphones and observe the reading in dB A on the screen.
Go to a
quiet area and set your MP3 player to your regular listening
volume. Then, measure your volume level with a sound level
Music level in quiet _____________ dB A
area that has a background noise of ~ 65 dB and adjust your
MP3 to a comfortable volume level and measure this level.
Music level in noise _____________ dB A
What did you observe?
How did the background noise
affect the level that you set your music?
Did the music sound louder
when you were listening in noise?
What do you expect would have happened if you were
wearing sound occluding headphones or noise cancellation
You will have noticed that the background noise in
situation 2 caused you to increase the sound level that
you set your music to.
Despite the increase in sound level, the music
itself didn’t seem any louder. This is because the
background noise from the environment is interfering
with you hearing your music. In other words, you are
hearing both the noise and the music as opposed to
hearing just the music.
Sound occluding headphones or noise cancellation
headphones block out the unwanted sounds found in a
noisy environment. If you were wearing these headphones
when you entered situation 2, mostly likely you would
not have to increase the sound level of your MP3 player,
and if you did increase the sound level, you would
definitely perceive the music as being louder.
Ear Identification Game
Audiology Word Search