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Selina Solutions Class 8 Physics Solutions for Exercise Short/Long Answer Questions in Chapter 7 - Sound
Question 1 Short/Long Answer Questions
Q1) How does sound travel in air?
Answer:
Solution :
Sound is a mechanical wave which results from the back and forth vibrations of the particles of the air medium through which the sound wave is moving. These vibrations in the air are caused by the vibration of the objects that generates the sound.
Video transcript
"hello students welcome to Lido
learning's question
and answer videos my name is pallavi and
i teach
math and science at nero let's have a
look
at this interesting but easy question
that is
how does sound travel in air so we know
that sound
is a mechanical wave so what does
what do you mean by mechanical wave it
means that
a medium is required for sound
to travel so always we need
a medium for sound to travel it's very
much unlike
light which is an electromagnetic wave
and it does not require any medium
to travel so now
we have understood how what type of wave
sound
is right now let's talk about the
propagation
so sound is a mechanical wave which
results
from back and forth vibrations
of the particles of air medium through
which
the sound wave is moving now to
understand this let's say
this is our sound wave this is our
source from which the sound is coming
as the source vibrates it makes the
particles
of the medium also vibrate back and
forth
along the propagation direction of
propagation of the wave
so again let's compare that to
understand this better let's compare
that to a light wave so when
lightweight is called a transverse wave
that is
the particles in the medium they vibrate
perpendicular to the direction of
propagation of the wave
so this is what happens in transverse
waves
whereas sound wave is called
a longitudinal wave where
the medium the particles in the medium
these blue spots which you see here are
the particles of the medium
so they as you can see they are
vibrating back and forth
as the wave goes along and they are
transferring the energy
so these vibrations in the air are
caused by vibration of the object that
generates the sound so when this object
is generating sound this also vibrates
and as a result
it pass the energy to the particles of
the
medium and that is how it keeps on going
and that is how it reaches our
ear that is this is the receiver so i
hope you understood how
sound travels in air so the main points
from this video to be taken is sound
is a mechanical wave which is also
called a longitudinal wave
and what do we mean by mechanical wave
it means that
the medium is required is required
for sound to travel and
the most important part is the particles
of
medium the particles of medium
they are vibrating
vibrate along
the direction of
propagation of the wave that is parallel
to the direction of
propagation of wave and not
perpendicular to it
so i hope you understood the meaning of
how sound travels in it
if you have any further questions please
post your comments below
thank you"
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