The aim is for the pupils to understand the function
and importance of the ear, so that they will turn their
MP3 players down to prevent damage to their auditory
systems. On a journey from a sound source to the
inner ear, sound production and the anatomy of the
ear are explained.
Auditory walking tour
Get the pupils to take a walk through the grounds of
the school or kindergarten, once with and once without
earplugs, to experience the loss of environmental
impressions when they partially ‘switch off’ their hearing.
They will also learn about the dangers that (partially)
deaf people are exposed to.
do we really hear everything?
The human ear can perceive sounds with 20 to 20 000
oscillations per second. The number of oscillations per
second is called the frequency. As we get older, we
lose the ability to hear very high frequencies. Dogs
can hear sounds with up to 35 000 oscillations per
second (35 kHz), bats even higher-frequency sounds.
Use a normal whistle and a dog whistle for the children
to compare. Typically, a dog whistle is within the
range of 16-22 kHz, with only the frequencies below
20 kHz audible to the human ear (and depending on
the individual state of your hearing, you may not even
hear these).
Adjust the volume of a signal generator with amplifier
and loudspeaker to a medium level at an audible frequency.
Then turn up the frequency to 50 kHz, and
slowly tune it down from there. Ask the first child who
can hear something to describe the sound (a highpitched
whistle).
do our ears have favourite sounds?
An individual auditory diagram
By testing our own hearing range, we can estimate the
state of our hearing. Connect a signal generator with
an oscilloscope and loudspeaker as indicated (see
image below).
Using the signal generator, generate sounds between
250 and 16 000 Hz according to Table 1. To make the
sounds comparable, make sure that they all generate a
‘wave line’ of equal ‘height’ on the oscilloscope.
The aim is for the pupils to understand the function
and importance of the ear, so that they will turn their
MP3 players down to prevent damage to their auditory
systems. On a journey from a sound source to the
inner ear, sound production and the anatomy of the
ear are explained.
Auditory walking tour
Get the pupils to take a walk through the grounds of
the school or kindergarten, once with and once without
earplugs, to experience the loss of environmental
impressions when they partially ‘switch off’ their hearing.
They will also learn about the dangers that (partially)
deaf people are exposed to.
do we really hear everything?
The human ear can perceive sounds with 20 to 20 000
oscillations per second. The number of oscillations per
second is called the frequency. As we get older, we
lose the ability to hear very high frequencies. Dogs
can hear sounds with up to 35 000 oscillations per
second (35 kHz), bats even higher-frequency sounds.
Use a normal whistle and a dog whistle for the children
to compare. Typically, a dog whistle is within the
range of 16-22 kHz, with only the frequencies below
20 kHz audible to the human ear (and depending on
the individual state of your hearing, you may not even
hear these).
Adjust the volume of a signal generator with amplifier
and loudspeaker to a medium level at an audible frequency.
Then turn up the frequency to 50 kHz, and
slowly tune it down from there. Ask the first child who
can hear something to describe the sound (a highpitched
whistle).
do our ears have favourite sounds?
An individual auditory diagram
By testing our own hearing range, we can estimate the
state of our hearing. Connect a signal generator with
an oscilloscope and loudspeaker as indicated (see
image below).
Using the signal generator, generate sounds between
250 and 16 000 Hz according to Table 1. To make the
sounds comparable, make sure that they all generate a
‘wave line’ of equal ‘height’ on the oscilloscope.
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