What is sound all the details and information about Science and musical instruments

What is sound all details and information of Science
What is sound all the details and information about Science
Look at this photograph what do you see here strange we'll see a lot of musical instruments see this is a musical instrument this you know so you can see different type of musical instruments on this photograph asteroids why we are seeing at these many types of musical instruments here because trends the next chapter which we are going to study here is called sound it's a very important.

Sound all the details and information about Science

Chapter Sprint's and a very interesting one as well so sprints let's start and let's start this chapter with full energy and full enthusiasm so it rains so the first important point here to see about sound is that sound is a form of energy strange sound is a form of energy so sweets by now we know about many forms of energy can you name a few of the strange this kind kinetic energy right this kinetic energy what is kinda crazy students can you briefly tell me if an object is moving.

We say it has kinetic energy streets then there are other forms of energy like sprints heat energy right so it's very obvious what is heat energy than electrical energy registrants so you understand what is electrical energy so there are different forms of energy straights similarly sound is also a form of energy registrants and as you know energy cannot be formed or destroyed only its form can change now this is a powerful statement and I am sure strange you are aware of this you have studied about this in previous chapters of science.

Or previous classes that energy cannot be formed or it cannot be destroyed only its form can be chased let me give you some examples look at this loudspeaker strange we know that it produces sound right difference when you play it it will produce sound now how it produces sound strange we switch on electricity right so we supply electricity to the speakers and they produce some so it's what is happening here that electricity which is a form of energy is being converted to sound energy so in this example electric energy is being converted to sound.

Energy's registrants let me give you one more example see this is a very simple way of producing sound you can clap right when we clap sound is produced isn't it so what is happening here insurance see if you keep clapping you will be tired so what happens here that you muscular energy your muscular energy is actually transformed into sound energy so in straights you can see these are some examples in which energy is not being formed or not being destroyed but it is being changed its form is being changed in this case from muscular to sound energy and in this case from electrical to sound energy okay now we are moving to the mean section in this chapter that is called production and propagation of sound.

so, first of all, we need to understand the meaning of these two terms what is the meaning of production of sound and what is the meaning of propagation of sound it is very simple actually look at this photograph strains you can see a teacher is reading out something so obviously he is producing some sound he is he is producing some sound it's fruits right and this sound then travels to children travels to children that's why children are able to listen to the song right streets now see a similar thing happens here to see this is a bell strange and.

Bell is being hit like this so what happens it strains the bell rings so sound is produced right and then this sound travels far and wide far and wide so even if you are standing far from the Bell you can listen to the song right so what is the production of sound so see production of sound is very clear right when this person is speaking his producing some so that is production of sound when you are hitting this.

Bell is sound is being produced so this is production of somewhat is propagation of sound restraints when sound travels we say it is propagating that is propagation of sound when sound travels it is propagation of sound now we want to understand how this production and propagation of sound actually happens so let us take the example of this Bell students so when the Bell is hit what happens that this Bell starts vibrating like this Bell actually starts vibrating like this so this Bell does vibrations or we can say this bill does oscillations or we can say that this bill does to and fro motion okay so wait and see once you hit the.

Bell it actually moves ahead it comes back then it goes this way and then it comes back then again it goes ahead comes back goes this side and then comes back and it keeps doing this very quickly right so you may not notice it but it actually happens and such a motion is called vibration or it is called oscillation or it can be called to and fro motion let me give you one more example of to and fro motion a very simple example okay.

so look at this photograph students I'm sure you must be knowing who is this gentleman right so let's not focus on the gentleman but let's see what he is doing he is sitting on this swing right Stinson you know in your childhood, in fact, you are still in your childhood you must have sit on this swing and you know it moves like this such a motion is called vibration or oscillation or to and fro motion right these all terms are similar to each other similarly one you hit the Bell vibrations happen now sound is actually.

produced due to this vibration let me tell you how so now suppose this Bell is vibrating here because you hit it and you are standing here and this is your ear okay so notice you are standing here and this your ear now what is there bit in between your ear and the Bell in between there will be air straight right and in air they are lots and lots of small molecules or you can say lots and lots of small particles now see what happens when this Bell does to and fro motion you know there will be some molecules of air at this place so when this.

Bell will do to and fro motion it will collide with this molecule on many molecules which are present it will collide with many molecules which are present here and due to these collisions, these molecules will also start being a similar type of to and fro motion similar type of to and fro motion you understand strains this.

Bell is doing to and fro motion so it will collide with molecules of air here and they will also start doing to and fro motion they will go ahead come back go on this site then come back and they'll keep doing this motion is friends fine now what happens when these molecules start doing to and flow motion they will collide with molecules ahead of them these molecules they will collide with these molecules then these molecules also start doing to and fro.

motion now these molecules collide with molecules ahead of them and they also start going to and fro motion when these molecules start colliding with molecules ahead of them and they also start going to and fro motion so I hope you stretch your understanding what's going on now this molecule will collide with molecule head of it and due to this it will also start doing to end flow motion so due to this you can understand that this molecule then this molecule that this molecule then this all these molecules.

Will start going to and fro motion right all these molecules will start to and fro motion and when the molecule affair near your eardrum does to and fro motion then you hear sound difference then you hear some you understand what is going on this is going to and fro motion this Bell due to which these air molecules start going to and fro motion they collide with molecules ahead of them they start doing to and fro motion and this process keeps continuing finally when the air molecule in front of your eardrum oscillates or does to and fro motion you hear sound States you understand so this is how.

sound is produced and propagated so you can see sound was produced here by the Bell and it has propagated it has traveled to you so this is how it happens so strains this Bell here will be called source of sound because it is producing sound and this area here is winds air it will be called medium this is an important term until called medium why it is being called medium strains because sound is traveling through it traveling through air sound is traveling through air so some air is being called medium.

so once I can write down here sound is produced by vibrating objects as you can see a strange sound is being produced by this vibrating Bell so whenever sound is produced in whatever situation it is always produced by vibrating objects I will give you more examples to clarify this point second important point which I can write here is sound is propagated by to and fro motion of particles of medium you understand sound is propagated by to and fro motion of particles of medium here.

What was the medium strength air okay so strengths I told you this point that sound is produced by vibrating objects so let me give you more examples of this so strange look at this is a B this is a Bistritz it makes humming sound you must have heard to that difference it makes a humming sound strains so how it makes humming sound see strains you must have noticed that it has wings it actually vibrates its wings very fast its wings vibrate very fast like this right they move to and fro very fast like this and when they move to and fro like this they are actually producing sound right.

So what happens suppose you are standing here with your ear right so when these wings vibrate they collide with air molecules here right so these air molecules also start doing to and fro motion now these air molecules will collide with air molecules ahead of them and they will also start doing to and fro motion similarly all these molecules will start doing to and fro motion strains finally when the molecule of air close to your ear will start bringing to and fro motion you even hear the sound streets right so once again in this.

Case you can see that sound is being produced by a vibrating object as I told you right and it is propagating to the medium by vibration of particles of medium you understand for example strains let us take example of this loudspeaker right this is one of the very common things which produce sound strange so strange if you play a loudspeaker and high volume right you can actually try this experiment if you play a loudspeaker at high volume and if you look at this cone this is called cone of loudspeaker if you look at this cone very carefully you will notice that it vibrates you know little bit it moves to and fro it moves ahead and back.

Ahead and back I head back it vibrates so it produces sound by vibrating when it vibrates molecules here you know molecules of air here they also start vibrating you know then they collide with other molecules they also start vibrating and sound is propagating in the same manner at as it happened here is winds redshirts you can see this is a border it's when it flaps its wings you hear a sound why Sprint's because when it flaps its wings it is actually vibrating it right.

So sound is being produced now what will happen when it vibrates then molecules of air you know they will also vibrate after collision so sound will be produced and propagating similar is the case whenever sound is produced similar is the case when over sound is produced for example let us take example of this guitar so what happens strengths when it.

R is played you know these are the strings of guitar you know you must have seen that you know these strings are plucked right so they start vibrating you can even see in this image this string is actually vibrating in strains right so this string vibrates due to the sound is produced right when this string vibrates then air molecules here or air molecules here you know this vibrating string will collide with these air molecules so they will also start vibrating now this air molecule will collide with molecules ahead they will also start vibrating and sound.

Will propagate in this direction the same will happen in this direction so sound will propagate in this action as well you understand then it shrinks V human beings can also produce sound right we speak right norm is speaking to record this video and you can hear my sound strains so you know what is vibrating when we are speaking strains see when we are speaking our lips tongue they all vibrated strains to produce some not only the strains you know.

There is this portion in our neck if you look carefully you know we are not studying biology so we will not get into great detail this portion in our neck you know there is a pipe inside here that pipe also vibrates streets right and that's how sound is produced see so it's whenever there will be production of sound whenever they will be production of sound there will be some object which will be vibrating right there will be some objectively.

Vibrating let me give you one more example and a small experiment which you can actually very easily do so strains you can take a small box like this you know a small box like this and then this is a rubber band you can tie a rubber band like this on this box okay and then if you pluck this rubber band like this you will notice that it starts vibrating and you will hear a sound strange right so why sound is being produced because this rubber.

Band is vibrating vibrate right so as I told you sound is produced by a vibrating object in all the cases say I have given you so many examples in all the cases something was vibrating and sound was being produced so let me give you one more example strains this example is of tuning fork now what is tuning focus trains if you happen to go to laboratory physics or science laboratory in your school you will definitely see a small device like this which called uniform it is a very simple device and it is actually used to do experiments it is used to do experiments on sound occasions so when you also go to higher classes I will tell you now experiments.

Which you can actually do with this tuning fork but in ways trains let me give you a simple thing here based on tuning fork if you take this tuning fork and you had and if you hit this part of tuning fork softly to some other thing we'll call that you if you tap if you tap this part of tuning fork that means if you hit this part of doing Fox softly with anything maybe table you know or any other soft thing then reproduce sound spins it will produce some why it produces sound strains can you think why it must be putting is producing.

Sound the reason is simple strains when you hit it softly these things they start vibrating they start viability and due to this they produce sound roots right you know and you know what happens here when they start vibrating they will collide with molecule close molecules close to them then they will collide to molecules close to them and that man has sound will propagate distance right but it strains you will not be able to see the vibration here you will not be able to see the vibration here because what happens that these vibrations are very small and very fast so you cannot see them so let me write this down tuning fork vibrates on tapping it so it produces some fine but the vibrations are very small and fast so we cannot.

See them we cannot see them so we cannot see these vibrations because they are very little bit and they are happening very fast so straights here I just want to tell you some small experiments which you can do with this tuning fork to prove that it is actually vibrating right so let me tell you some experiments to prove vibrations of tuning fork so one the first experiment which I am going to tell you here is students that you can take a vessel in that vessel you can put some water okay so ends now you take two tuning fork so one tuning fork will be such that it is not vibrating right so if you have not tabbed it this is a tuning fork which.

You have not tapped you dip it in water like this and you take another tuning fork which you have tabbed okay so it's so you will see in this case that nothing happens in this case you will see that the water will be disturbed you will see that the water here you know it will be disturbed so it proves that the tuning fork is vibrating right see if the tuning fork is not vibrating then if you put it inside nothing will happen but if water.

Vibrates or water is disturbed around the steering fork what it means that this tuning fork is actually vibrating by distance water is disturbed so by doing this a small experiment you can prove that this tuning fork which is producing sound is actually vibrating if you put this vibrating tuning fork in water you will see disturbances in water may even spill out of it focus words now let me tell you another experiment so in this experiment.

You can you know hang a ball like this a very light ball, for example, a table tennis ball it a very light ball like a table tennis ball right so suppose we have two balls two light balls hanging like this now what will happen strains if you take a tuning fork which is not vibrating or not tap which has not been tapped you know and if you.

touch it to the ball and in the other case, you take another tuning fork like this which is actually vibrating what will happen so this to me for also you are putting we close to the ball let me draw that yeah like this so in this case when you put a nonvibrating tuning fork close to this light wall nothing will happen but in this case because this tuning fork is actually vibrating though you are not able to see it what will happen it will vibrate and hit the ball due to which this ball will move away move a radiance.

So by doing this experiment also you can prove that this tuning fork which is actually producing sound is actually vibrating registrants so once again I repeat whenever sound is produced something is vibrating so dear students I have been telling you again and again that when sound is produced they are vibrations right so now I am going to tell you about an experiment which you can actually do to prove this thing.

So we are going to see an experiment to prove that sound is accompanied by vibrations okay and this is a very simple experiment you can easily do it so first of all for that experiment you need to take a box like this it must be a hollow box so, for example, you may take a food can or maybe a coca-cola can but you must be careful that you need to remove this part this plate you know from the cat on both the sides on both the sides

So basically this can should be hollow right you should be able to see through it you understand if this portion will not be there and if this portion will not be there you will be able to see through a distance so that should be the case right then you take a stretched balloon sheet okay and you tie it at one end like this on top of it you can stick a small mirror right straights so this is a very simple setup you can do it and it will be a lot of fun doing this right then what you need to do is you need to locate a good clean wall okay in a dark room in a dark room you need to have a clean wall like this then there should be a small source of light somewhere here from which light will come okay very simple there should be a small source of light here from.

Which light will come there should be clean wall here okay now if you place the Box here you know with this plane mirror pointing towards wall you will see a spot of light here here it is why you will see a spot of light can you tell me that it is very simple straits you have studied about light in previous classes and very basic knowledge is required here can you tell me why will you see a spot of light see this is a source of light.

So light will come from this source it will hit this mirror and then it will be reflected it will fall on the wall and that is why you will see a spot of light very simplest ones right nonstraights you start speaking in front of this box you know at normal volume the way you talk to your friend right so in normal volume you know you start speaking in front of this box when you do that you will see that the light spot will start dancing it will start moving.

Up and down up and down so let me write this down so when you start speaking in front of box spot of light on wall starts moving to and fro it starts moving to and fro up and down swards now why is that happening can you tell me see strains it's happening because when you speak when you speak this balloon shade this balloon sheet here that starts vibrating okay right see when you speak then molecules of air here they start vibrating okay they collide with molecules ahead.

So they start vibrating they collide with molecules ahead so they start vibrating and then these molecules collide with the balloon sheet so the balloon sheet starts vibrating along with this balloon sheet this mirror also starts vibrating it starts and when this mirror starts vibrating this spot of light will start moving up and down up and down so you understand why this spot of light starts moving right so let me write this down students so when you speak the mirror on the balloon sheet vibrates causing the spot of light on wall to oscillate

Two oscillators now this observation this experiment proves that when sound is produced vibration sine water right see why this spot of light was actually vibrating it was vibrating because when you speak when you produce sound this mirror was also vibrating sweets so this experiment proves that sound is accompanied by vibrations registrants switch trains now we'll talk about medium in more detail students right so by now we already understand that medium is the substance medium is a substance through which what through which water which means through which sound travels so medium is the substance through which sound travels right difference, for example, we have seen the example of.

Bella strange right we have seen the example of Bell right so when the Bell is ringing sound travels through air and reaches to us so sound is traveling through air so we called air as medium straits right so you know so air is medium because air is medium here because sound is traveling through air right so generally air acts as medium for sound generally if you are talking with your friend you are speaking but the sound is traveling through air so this air is the medium strains now let me tell you a very interesting point and a very important point as well strains that medium of sound can be solid liquid or gas straits what it means is that sound can travel in solids liquids and gases straits see it's a very important.

Constraints that sound can travel in all the three forms of matter that solid liquids and gas now let me explain all these three so if we talk about gases it is very clear to you right for example air is a gas here is example of gas so sound can travel through air so we can clearly understand that sound can travel through gases now let me tell you about liquids so strains look at these fishes they are in water strains and you know some phases do produce sound you know another fish can listen to the sound so in this case, you can see that.

Sound is traveling through water which is a leak this is a liquid you know in fact you can do more experiments in strength suppose you are swimming in swimming pool stones like this you know so this is you who is swimming in swimming pool now this is the bed of swimming pool the floor of swimming pool okay now if you drop a Quine if you drop a coin you know so this coin will hit the bed of swimming pool and a sound will be produced right and you will be able to hear that sound you can do this experiment you.

Will be able to hear that sound how are you able to hear that sound the sound is being produced here and it is traveling through water to you so sound can travel even in liquid systems not only gases right now look at this photograph strands here I'll explain you that sound can travel even through solids see strands this is a small toy which you must have played within your childhood see there is a small cup here or a small hollow box here and similarly a cup or a small hollow box here and in the middle there is a rope you must be able to see there is a thin rope air strings or a thin thread hair strands thread right.

Which is actually a solid substance right strands now if a person speaks slowly in front of this cup the person here can listen to the Sun you know if this lady speaks slowly in front of this cup this lady will be able to hear the sound now how is that happening so, in this case, the sound here is traveling through this thread it is traveling on this thread and reaching to this puzzle so in this case sound is traveling to the thread which is a solid.

so you can see sound can travel through solid I am sure strange that you would have played with this toy in your childhood and you are understanding what I'm saying anyway let me give you one more example for solids so this is again a very small experiment which you can do with your friends so see you can lie down on a table like this is basically a table right a wooden table for example which is very easily available in your classroom or even at your home.

So you can lie down on the table like this with your ear touching the table okay and tell your friend to scratch the table here you know what to knock the table here you know so that a sound is produced now you will be able to hear that sound and you will clearly feel that this sound has actually traveled through this table you know if your friend makes a knocking sound here you will hear a sound hear that knocking sound here and you will clearly feel that that sound has traveled through this wood which happens to be solid sound can travel through.

Solids or you can also do a similar experiment like this here so see this experiment you can do solo you know you don't need any friend for this so just hold up rod like this you know one end of the rod should touch the ear now if you knock the rod here a sound will be produced and you will hear that sound is actually traveling to you through this solid oh this one's so sound can't travel in gases in solids as well as in liquids.

So the next point is truants regarding medium is that sound cannot travel without medium right see if you are standing and your friend is there but if suppose there is vacuum in between vacuum is there is nothing at all in between strains that even if you speak this sound will not travel to your friend and your friend will not be able to hear the sound while strains because there is no medium sound cannot travel without medium let me give you one more example look at this photograph is 20 you can see two.

Ostrom words in space right so in space strange there is no air I am sure you must be knowing it that in a space there is vacuum there is nothing right so if one astronaut tries to speak the sound is not going to travel to the another astronaut because there is no medium there so in space it is not possible to talk in space not possible to talk but can you tell me why it is why sound cannot travel without medium why what is the reason behind that I am sure students you must be able to think that we have already seen that if a person produces.

Sound they are vibrations right the molecules of air close to the person start vibrating then this molecule collides with molecules ahead so they also start vibrating then this collides his molecules ahead they also start vibrating right so these this way molecules start vibrating like this and sound travels okay but if there is no medium strains then obviously you can understand there is nothing here there is nothing as soon up thing is there to vibrate there is nothing which can vibrate here strains right so it is not possible for sound to propagate.
What is sound all the details and information about Science and musical instruments What is sound all the details and information about Science and musical instruments Reviewed by Techstudents on December 21, 2019 Rating: 5

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