Range of Hearing:Audible and Inaudible Sounds Video Lecture - Class 8

hello friends this video on sound part
16 is brought to you by exam for calm no
more fear from example so now we will
talk about the range of hearing we saw
that there we are able to hear with the
help of our hear now the question is
I'll be able to hear all types of songs
because wherever there is a vibration
there is a sound that is being produced
but is it that we are able to hear all
types of sounds or we are only able to
hear a particular set of sounds so that
is what we are going to talk in range of
hearing so it is the range of frequency
of sound which is audible to a living
being now this is again interesting now
it is not that all living organisms can
perceive but they can listen to sounds
of all frequencies the different living
organisms have ability to perceive
different frequencies of sound now for a
better understanding let us take the
example of human beings now in case of
human beings again we also have certain
set of frequencies of sound which are
audible to us we can hear only those
frequencies of sound so based on that
sound have been categorized into two
sections one is the audible sound the
other is the in audible sound so if you
look at it this represents the various
frequencies of sound now for human
beings the audible range starts from 20
Hertz so sounds of frequencies 20 Hertz
are audible to us and we can hear sounds
up to 20 kilo Hertz that is 20,000 Hertz
so this is our audible range so all the
frequencies which fall below the this
frequency range they form
audible sound because we can hear them
now anything any sound with frequency
less
20 Hertz are quite impressive and the
sound of frequency greater than 20,000
Hertz is ultrasound so infrasound and
ultrasound are inaudible to human beings
now please do remember that this I am
talking only about human beings now as I
mentioned that different living
organisms have different range of
hearing so it is not that for every
living organism this is audible
frequencies now if you compare the odd
in the range of hearing for a dog or a
cat or if human being they are all going
to be different so let us look at the
range of frequencies for some of the
different organisms so here we have
considered some organisms like humans
dogs dolphins fish sea lions bags frogs
birds and rodents see see you see on the
x-axis I have taken the frequencies and
these are in this frequencies are in
Hertz so you see for human beings just
now I told you it is from 20 Hertz to
20,000 Hertz so any 20 Hertz it is here
20,000 would be somewhere here so you
see for human beings it starts from 20
Hertz to 20,000 Hertz for dogs you see
the frequent range of hearing is even
greater than human beings so dogs can
hear frequencies which average fall in
our inaudible range dolphins are dogs
they almost have same range of hearing
fishes again they have different range
of hearing so you see for different
organisms they have different range of
hearing so whatever sounds we are able
to hear we feel that if you only do
sounds exist but there are a lot of
other sounds which exist which fall in
our body
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