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or snare drums-- of
course, these things
depend on how long
you listen to them,
so the damage is cumulative.
It may take many years
of exposure at 90 dB
to produce a hearing
loss even though exposure
to a really high sound
level, like the 160 dB,
may give you hearing loss
after just a single exposure.
So legally, employers
are supposed
to provide hearing
protection for their workers
if you send a worker
in to an 85 dB
sound pressure level
environment, like is
common in a factory,
you are supposed
to provide the workers
with hearing protection
if it's an 8 hour shift.
If it's only a 4 hour
shift, you don't have to.
If the sound level is 95 dB,
it's something like 2 hours.
If it's 100 dB, you can expose
someone to an hour of that
without hearing protection,
but if it's longer than that,
you have to provide
hearing protection.
So here's some example.
Movie theaters,
Godzilla is 118 dB
because it's a terrible roar.
It can be deafening if you are
right near the loudspeaker.
And if you go to
Godzilla 100 times.
OK?
All right.
So loud sound is one of
the causes of hearing loss,
so let's just make
a little list here.
High level sound
is certainly one
of the causes of
hearing loss, and I
think we have some
examples here.
So this is an example
from some research that
was done by one of
the professors I had
in graduate school, Joe Hawkins.
And he studied
temporal bones where
the cochlear is in humans.