Propagation of Sound (Hindi) Video Lecture - Class 9

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now let's study in this topic that how
sound propagates a cacophony kapa haka
sound gets produced would be here the
sound is produced basically by
vibrations Jesse agar Ambedkar a bell ki
awaaz ahkamaat a chill act eastern ma
similarly to buzzing sound of bees or
team very irritating and mosquito
buzzing sound also it's very irritating
to hear and all the various types of
sounds are created by vibrations compel
key balcony to bail me basically a camel
plays toda hey boo hammer jovica either
near brass plates a strike tárrega in
that condition the sound of Bell is hurt
similarly drum may be as we have already
studied that there is a diaphragm and
when the diaphragm is hit then the
vibration creates and it causes the
sound likewise the buzzing sound of bees
and mosquitoes are also heard by their
flapping wings to up they created just
teach Kabaddi may be bath Curry who ha
Muji's May after vibration attached it
Oh Lucy emerges a hunk o Abbas soon IDT
him usual vibrations saying he basically
egg Tariq acre disturbances jab a a
particle seducer a particle travel Jota
hair those condition may weaken here
some or up is steady make an exact a
heavy particle apne jurgis a displaced
nahi hota hookah carton Watney
disturbance do sweeper pass cotton a
there without changing their position
just happy they kakai ball game be a
kilt a toke I saw a hunk a captain a
kick which objects and Houska a keep
each AKP shake series mayhem lamb
misaligned Mila God attempt
I've never a go object kugel ayah top
kadek tanky crane kita Rosario objects a
cake body cable a cable ganache arewho
jete
so he camera objects top knee jaga
perfect
a satiny hankie first objects move o
kalashnikova check your name Vova HEPA
regolith object first per year second
object second per year looking apne
gerbils could disturb Kia doubles
condition may lose Medusa who disturbed
clear Deus Trinity Circle disturbia and
so on as a pulley chain Paso today Jeff
nahi Sally disturbances Pula end that
nahin pass ho chi so I mean the same
thing that is how the sound propagates
disturbance G of a particle seduced a
particle without any movement path so
teahouse conditioned me he hung Abbas so
certain
so this is about the propagation of
sound gauge of a bar by disturbance ki
baat karu who basically I am talking of
the very important term in physics that
is called vase - jaha will be particle
up K display so they hang disturbance
created ahead whose condition may
Humboldt in here that the wave is formed
so what is a wave the wave is basically
a disturbance created in the medium when
the particle sets neighboring particles
in action all we can say when it says
the neighboring particles in motion so
that is all about a wave i'ma go home
sound giveth car into sound maybe M same
phenomenon up like Ultima disturbance
Paso T here that means the sound is also
called as mechanical wave every sound
wave key hum coach important properties
for atoms they change a big boy object
vibrate kurta hey to vibration with
doorstep or 10 panelist ergo object
advocated of musket I do say step may go
object P shaquita of moonscar time to
subscribe LM dick they make your
objective aggregate of move car ahead
stop Java time now when the vibrating
object moves in forward direction to say
attach your ear hair bows air pay
pressure legaia almost air cook compress
called
Ollis airpo compressed Karabakh whoa ha
ha ha pressure it Nevada Baja Vega that
it becomes high a pressure banana same
onomatopoeia Hey
I mean kick particular density may are
the number of particles Burge i - i'm
gangee that that is the region of high
pressure or jump vibration cabbage sa
high pressure region create jota hair -
hum was point who get a head compression
similarly agar hum vibrating object
kaduche what case discussed current this
may hum object capisci keaton of
consider cousin to Jessie here object a
mother pitch Chiquita la Vega who air
could relax cartega Oranje Mirko relax
co- a hopper low pressure creator jaga
what I need by low pressure that in a
particular density the particles are
very rare 0.0 Humboldt they have rare
sections on the edge of vibration or to
him who step-by-step tonio them one to
one to go after it no rapid movement or
that you can hardly notice it goes to
flow to flow continuously in a rapid way
it's come a club a muhammad continuously
compression rarefaction compression
rarefaction jota Gila Haga and this is
how the sound wave is created gyro
compression or rarefaction give me a
bath curry who yaha say a call what
important term I ahead
that is called longitudinal now let's
see the type of phase there are
basically two types of waves the first
is longitudinal wave and the second is
transverse wave to subsequently embark
at a longitudinal wave key hibiscus
imagine Akili let's perform a very
simple experiment ham bukkake I explain
Lee Foskey egg and Koval say attach
kardia do so and FK hath mayhem I've
gotta say Henk each spring co-op nice
stretch Kia Jaffna sprinkle stretch Kia
- - coil spring coil said go up the
kingi coffee dude dude was angry
a jab recoils dude okay so that
represents the region of low pressure
and that is called real fractions to
give many October taiyaki rarefaction
cometh lava when the particles are not
tightly packed
they are very loosely packed the coil
skinny case make a decree if they are
far apart from each other
similarly above spring coke compressed
carry through press create those
condition of carrying a key coils to him
who both closely spaced obey what Posada
Haig do circuit disk image a slave a
hopper high pressure region create auga
and that resembles the compassion in the
air now by continuously pressing and
stretching the spring we see compression
and rarefaction alternatively so this is
called log eternal waves and this is the
more simple experiment for us to
understand what is compression and what
is rare faction now let us move on and
let us connect it with the sound waves
to sound waves you might travel curtain
a it is also in the form of longitudinal
waves that is its major particle so then
whoa apne jaggus in a move curtain here
they just move back and forth like we
have seen the case of a spring spring
maybe two coil stay they are moving only
back and forth without displacing their
position likewise the particle let's say
in the air in that condition also the
particles move back and forth without
displacing their position the
longitudinal waves may agar apni notice
kya hota scum movement guess I am
Dicky's me though she is common hence it
just Direction may offspring go compress
called a hey young school relax color so
that is along the horizontal direction
or just Direction may particle move
curly hair
whoopee horizontal direction may both
are in the same
direction or this movement Kohan both
inhale longitudinal waves so sound waves
are basically longitudinal waves now
let's talk of second type of wave that
is transverse wave transverse wave is
just opposite to that of longitudinal
wave it's made of particles of movement
here that is perpendicular to the
direction of motion mclubbe kowalska k
agar aapke object kisi horizontal
direction remove car ahead to escape
budget stage of particle displaced
wording it whoa RK vertical Direction
may move correctly
jessa suppose optically a cake hook say
a clásico attached collegiate Rasika of
a kind Pagani J or a post male Agata to
and fro movement is your Bihar ki tarah
frosty Kokichi so after taking a key up
to the direction of motion and with the
Baha'i tariff a horizontal plane may
hence we can just sing ado movement a
vodka Cooper or Nietzsche up and down
movement a that is along a vertical axis
so that is the example of transverse
wave or is my conceive a party hey that
comes the light waves so this is all
about the propagation of sound waves now
let's summarize what we have studied
till now the sound is produced by the
vibration that causes the particles to
strike the nearest particle the second
is due to vibrations the disturbance is
created and this disturbance is called
wave that is why the sound is also
called mechanical wave during movement
of the vibrating objects the region of
high pressure is called compression and
the region of low pressure is called
rarefaction when the particles of the
medium moves in the same direction to
that of the direction of propagation of
disturbance then it is called
longitudinal waves when the particles
move in perpendicular direction to that
of the direction of propagation of wave
is called
was vivre