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NCERT Exemplar Solutions Class 9 Science Solutions for Sound - Exercise in Chapter 12 - Sound
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Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?
Answer:
Humming bees produce the sound by beating their wings and the frequency of the sound they produce will be in the range of 20Hz to 20000 Hz which is audible. On the other hand, pendulum produces sound less than 20 hz which is below the audible range and we don’t hear the sound of pendulum vibrations.
Video transcript
"hello everyone welcome to leader
learning
i am gurpreet your science tutor
today's question is why do we hear the
sound
produced by the hummingbird
or humming bees while the sound of
vibrations of
pendulum is not heard
so here we have to give a reason
that why we are not able to hear
the vibrations of the pendulum and
but we are able to hear the hummingbirds
sound so let's start our answer
the audible range
audible range of human beings
is 20 hertz
to 20 000
hertz and these
humming bees
they produce
the sound by the
beating of their wings
and
the sound produced by the wings
is in the range
range of 20 hertz
to 20 000 hertz
so this comes in the audible range of
human beings
and hence it is hearable
it can be heard but
if we talk about the vibrations of
pendulum
the vibrations of pendulum
produces
a sound
less than
20 hertz
which is
below the audible range
and therefore this sound is not
heard bias for more such videos
please subscribe leader learning and for
any doubt
drop a comment thank you"
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