Factors affecting Speed of Sound | Class 9 | CBSE | NCERT | ICSE

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  • Опубликовано: 11 дек 2024

Комментарии • 284

  • @mkhanstar9552
    @mkhanstar9552 6 лет назад +40

    Dear g
    If density decrease the speed increase
    Then how we say speed is greater in solid is greater than the speed in liquid
    We know desity of solid is greater of solid is greater than liquid

    • @DeltaStep
      @DeltaStep  6 лет назад +1

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    • @mkhanstar9552
      @mkhanstar9552 6 лет назад +1

      Ok

    • @Shawn47474
      @Shawn47474 5 лет назад +6

      @@mkhanstar9552 dont it's a scam

    • @danielmichaeli8244
      @danielmichaeli8244 5 лет назад +4

      @@mkhanstar9552 it has to do with the mediumds elastic properties. These properties usually increase with higher density, but the increase in the elastic properties is much greater than the increase in density, so the total sum equals a bigger velocity

    • @praveenbeep1822
      @praveenbeep1822 5 лет назад +1

      Sir please clarify this doubt

  • @garimaagrawal8240
    @garimaagrawal8240 4 года назад +6

    Thanks for such a great explaination 😀😊

    • @DeltaStep
      @DeltaStep  4 года назад

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  • @qamrunnisashaikh1509
    @qamrunnisashaikh1509 2 года назад +1

    Thanks brother... May Allah bless you

    • @DeltaStep
      @DeltaStep  2 года назад

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    • @agrajasajikumar5623
      @agrajasajikumar5623 2 года назад

      Yea

  • @zooziesharma1012
    @zooziesharma1012 2 года назад +1

    all u taught was understandable. it was pleasent for my ears thanks. gbu. imy. ily.

    • @DeltaStep
      @DeltaStep  2 года назад

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  • @prashantshinde560
    @prashantshinde560 6 лет назад +7

    Sir but it travels faster in solid than in liquid and gas..
    how density is inversely proportional...
    plz explain

    • @bhanubhawesh5491
      @bhanubhawesh5491 6 лет назад +2

      Same confusion after seeing the video

    • @MKGamingWorld
      @MKGamingWorld 6 лет назад +1

      that's my question too

    • @MKGamingWorld
      @MKGamingWorld 6 лет назад +1

      and its answere will never ever come

    • @roneeshphuyal3932
      @roneeshphuyal3932 6 лет назад +1

      It's only for the case of air

    • @darshandhabale143
      @darshandhabale143 6 лет назад +5

      That point in the video is wrong, density decreases as temperature increases-accepted
      But we cannot State that speed of sound depends only upon the density, (inversely proportional to density)
      We have to consider the temperature along with it, if we keep the temperature constant, the density is directly proportional to the speed of sound :)

  • @Kattarहिंदुस्तानी
    @Kattarहिंदुस्तानी 3 месяца назад

    Very nice lecture $explanatin 🎉🎉

    • @DeltaStep
      @DeltaStep  3 месяца назад

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  • @jd3k
    @jd3k Год назад +2

    I'd like to see blue for lower and red for higher... 🙂😊
    Apart from that, amazing video. Thanks so much 👍

    • @DeltaStep
      @DeltaStep  Год назад

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  • @Akshaya5
    @Akshaya5 Год назад

    Wow!! Thank you very much😃👍

    • @DeltaStep
      @DeltaStep  Год назад

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  • @ELECTORATEPLUS-qh2xf
    @ELECTORATEPLUS-qh2xf Год назад

    Sir you explain very similar to my school teacher and more than him thankue so much ❤❤❤❤❤

    • @DeltaStep
      @DeltaStep  Год назад

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  • @nareshbholo123
    @nareshbholo123 6 лет назад +5

    Nice explanation sir..

    • @DeltaStep
      @DeltaStep  6 лет назад

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    • @Shawn47474
      @Shawn47474 5 лет назад

      @@DeltaStep stfu

  • @sapankumarverma3097
    @sapankumarverma3097 5 лет назад

    Ur way of teaching is superb....

    • @DeltaStep
      @DeltaStep  5 лет назад

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  • @NikhatPerween-q4f
    @NikhatPerween-q4f 10 месяцев назад

    Boss you are great , thanks ❤

    • @DeltaStep
      @DeltaStep  10 месяцев назад +1

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  • @sheetalbaniya5878
    @sheetalbaniya5878 6 лет назад +2

    You are too good sir
    👌👌👌

    • @DeltaStep
      @DeltaStep  6 лет назад

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  • @gopalsarda6615
    @gopalsarda6615 2 года назад +1

    Thank You sir 🙏 YOU EXPLAINED VERY NICELY….👍👍👍👍THANK YOU ONCE AGAIN

    • @DeltaStep
      @DeltaStep  2 года назад

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  • @himanshukumarhimanshukumar4518
    @himanshukumarhimanshukumar4518 2 года назад +1

    Thanks bro you teach me very easily in depth and I able to understand your explanation line by line.

    • @DeltaStep
      @DeltaStep  2 года назад

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  • @hariommourya4117
    @hariommourya4117 5 лет назад +1

    Thank you very much sir

    • @DeltaStep
      @DeltaStep  5 лет назад

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  • @Azif45628
    @Azif45628 4 года назад +1

    If Volume Increases, Density Decreases but Collisions and movements b/w particles decreases so speed should be decreased...

    • @DeltaStep
      @DeltaStep  4 года назад

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    • @amitparihar6283
      @amitparihar6283 3 года назад

      No on heating collision between particles increases as there kinetic energy increases as a result their speed also increases .

  • @dabasashish94
    @dabasashish94 4 года назад +1

    if no. of molecules increases then speed sound of will be slow...plz check this fact or if im wrong plz correct me

    • @DeltaStep
      @DeltaStep  4 года назад

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  • @nirbhikviswas
    @nirbhikviswas 4 года назад +2

    6:20 why do not you explain this with an animation? If the water molecules increases in no why dont the density increase???

    • @ahanadas288
      @ahanadas288 4 года назад

      Then vol.will increase
      V invers.prp to rho
      Hence rho will decrease

    • @DeltaStep
      @DeltaStep  4 года назад

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  • @cutekids6435
    @cutekids6435 5 лет назад +4

    you have left one more important factor affecting velocity of sound...that is pressure...
    velocity of sound is not affected by change in pressure so long as temperature remains constant.
    on diff temp pressure matters

    • @DeltaStep
      @DeltaStep  5 лет назад

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  • @ABHISHEKKUMAR-uu7qv
    @ABHISHEKKUMAR-uu7qv 6 лет назад +1

    U deserve a better platform

    • @DeltaStep
      @DeltaStep  6 лет назад +1

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  • @darshandhabale143
    @darshandhabale143 6 лет назад +1

    That point in the video is wrong, density decreases as temperature increases-accepted
    But we cannot State that speed of sound depends only upon the density, (inversely proportional to density)
    We have to consider the temperature along with it, if we keep the temperature constant, the density is directly proportional to the speed of sound :)

    • @feliwx4087
      @feliwx4087 6 лет назад

      It depends on the elasticity and the rigidity of matter . the elasticity of the medium depend on the temperature , though . but while keeping the temperature constant . speed of sound depends of the √Elasticity/√density.

  • @devendrasinghchauhan3811
    @devendrasinghchauhan3811 6 лет назад +1

    Sir u explained so good
    Thank u

    • @DeltaStep
      @DeltaStep  6 лет назад

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  • @pritisharma9936
    @pritisharma9936 5 лет назад

    guys don't compare the factor density and humidity with temperature.... for temp key factor is kinetic energy other factors affect that very least... so elasticity and k.E overcome that ....and besides that density and temperature have different relation and even all these have different variation with water gas and solids see that in class 11th physics

  • @nakulsainiclass8throseroll562
    @nakulsainiclass8throseroll562 2 года назад

    It is really a great explanation it is wanted that every school teacher should teach like this

    • @DeltaStep
      @DeltaStep  2 года назад

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  • @miruthulasmaths6745
    @miruthulasmaths6745 Год назад

    Nice explanation 💙👍

    • @DeltaStep
      @DeltaStep  Год назад

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  • @ChandanKumar-jp4iq
    @ChandanKumar-jp4iq 6 лет назад +2

    Confusing on den sity as solid liquid

  • @shilohpatten3761
    @shilohpatten3761 4 года назад +1

    What about solids being more dense than air? Then, increasing the density would increase the velocity of sound. So, what's the catch? Is acoustic theory incorrect?

    • @DeltaStep
      @DeltaStep  4 года назад

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    • @SupersonicSynthwave80
      @SupersonicSynthwave80 Год назад

      Good question ! The thing is, he didn't talk about an important factor that affects the speed of sound between fluids and solids. He did not mention the Elasticity of the material! Sound in solids, because they are very dense, travels faster than in a denser gas, because in solids the elasticity of the medium is much greater than in gases. In gases, another factor also comes into play that makes it lose speed much more than in solids, compressibility. There is no compressibility in solids and liquids and therefore the elasticity is much greater in these media, that even a denser Air, due to its variable compressibility, delays the shock and the faster advance of the molecules of that Ar (lower propagation velocity)... Because of this compressibility in gases, affected by relative temperature, sound takes much longer to travel in this medium. That's why sound travels much faster in solids than in denser gas.

  • @physicsbyfg6352
    @physicsbyfg6352 Месяц назад

    Water vapor replace air the air molecules and density of air decrease thus the speed of sound increased

    • @DeltaStep
      @DeltaStep  Месяц назад

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  • @krishivkeinth2780
    @krishivkeinth2780 3 года назад +2

    Hello sir,
    Your explanation is really fascinating but I have a doubt. Could you please clear it out?
    You said that if tempreture increases, density decreases, till here I understood. But how decreasing density increases the speed of the sound in air...
    Hope you would reply and make it clear... ☺️

    • @DeltaStep
      @DeltaStep  3 года назад

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    • @sakshamsharma7751
      @sakshamsharma7751 2 года назад +1

      dhoka

  • @shivanihr5879
    @shivanihr5879 4 месяца назад

    If speed of sound is constant (344m/s) then why do we calculate speed of sound for different wavelengths, with the formula ... speed of sound = frequency x wavelength. Because there are numericals given in kid's textbook to find out speed of sound with the given frequency and wavelength. Some websites on Google says speed of sound is uniform (344 m/s) and does not depend on frequency or wavelength, when the opposite is clearly given in the formula. Please explain.

    • @DeltaStep
      @DeltaStep  4 месяца назад

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  • @amitkumarsah1665
    @amitkumarsah1665 Год назад

    Thank you bhai grat explation

    • @DeltaStep
      @DeltaStep  Год назад

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  • @neetubawa4233
    @neetubawa4233 3 года назад +3

    correction:- density of humid air is less as compared to density of dry air
    as density is inversely proportional to velocity of sound therefore speed of sound increase if humidity increase!!!!

    • @DeltaStep
      @DeltaStep  3 года назад

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  • @krsnknt
    @krsnknt 4 года назад

    Thank-you sir Kaas aap mujhe 12 class mai hi Mila gaye hote to aaj mai. Kuchh aur hota .
    Thank-you very much sir
    You are great..🙏

    • @DeltaStep
      @DeltaStep  4 года назад

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  • @contactkarthik1239
    @contactkarthik1239 6 лет назад +1

    Very good. I have a doubt if the temperature increase humidity will vaporize correct or not. It looks conflict

  • @usefully_useless
    @usefully_useless 2 года назад

    Tysm helped a lot 😊

    • @DeltaStep
      @DeltaStep  2 года назад

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  • @alizain3144
    @alizain3144 4 года назад +1

    If density increases its mean the particals of the medium become closely packed and than volume also increases and you say opposite of this so it make confusion for me ?

    • @DeltaStep
      @DeltaStep  4 года назад

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    • @Mini_mall-99
      @Mini_mall-99 3 года назад +1

      Volume will increase only when u supply heat to it..... other wise no

  • @Riscajojo
    @Riscajojo Год назад

    Thx sir better explanation

    • @Riscajojo
      @Riscajojo Год назад

      So wen do we normally meet

    • @DeltaStep
      @DeltaStep  Год назад

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  • @sanskrutibhosale2253
    @sanskrutibhosale2253 Месяц назад

    Sir then why it is given as velocity of sound directly proportional to square root of temperature

    • @DeltaStep
      @DeltaStep  Месяц назад

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  • @jayantshukla5286
    @jayantshukla5286 7 лет назад +1

    u said that solids have molecules compactly arranged mean high density so high speed but after some time u r saying that density is inversely proportional. sound

  • @himanshuray4413
    @himanshuray4413 3 года назад

    Thanks sir....🥺

    • @DeltaStep
      @DeltaStep  3 года назад

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  • @gaurav2904.
    @gaurav2904. 4 года назад +1

    If density is indirectly proportion to speed of sound,then why speed of sound is more in solids than liquids or gases?????

    • @DeltaStep
      @DeltaStep  4 года назад

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    • @SupersonicSynthwave80
      @SupersonicSynthwave80 Год назад

      Good question ! The thing is, he didn't talk about an important factor that affects the speed of sound between fluids and solids. He did not mention the Elasticity of the material! Sound in solids, because they are very dense, travels faster than in a denser gas, because in solids the elasticity of the medium is much greater than in gases. In gases, another factor also comes into play that makes it lose speed much more than in solids, compressibility. There is no compressibility in solids and liquids and therefore the elasticity is much greater in these media, that even a denser Air, due to its variable compressibility, delays the shock and the faster advance of the molecules of that Ar (lower propagation velocity)... Because of this compressibility in gases, affected by relative temperature, sound takes much longer to travel in this medium. That's why sound travels much faster in solids than in denser gas.

  • @snehadwivedi3548
    @snehadwivedi3548 5 лет назад

    Explanation is too good

    • @DeltaStep
      @DeltaStep  5 лет назад

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  • @shaikhabdullah7500
    @shaikhabdullah7500 4 года назад

    Better explanation than school teachers

    • @DeltaStep
      @DeltaStep  4 года назад

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  • @nirmalsarkar1803
    @nirmalsarkar1803 6 лет назад

    Very clear explanation..

    • @DeltaStep
      @DeltaStep  6 лет назад

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  • @hamidalam3472
    @hamidalam3472 3 года назад

    Some thing is wrong .....increase in density leads to increase in pressure.....therefore P/rho remains constant and no effect of velocity

  • @abdulwadood3497
    @abdulwadood3497 6 лет назад

    Confusion high temperature's kinetic energy may be infaver but low density can not be in speed of s

    • @DeltaStep
      @DeltaStep  6 лет назад

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  • @sipradarsinilenka2670
    @sipradarsinilenka2670 5 лет назад +1

    If speed of sound is inversely proportional to density why speed of sound is faster in solid and decreases rapidly to gas

    • @DeltaStep
      @DeltaStep  5 лет назад

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  • @arvindtoppo8708
    @arvindtoppo8708 7 лет назад

    thanks for your explanation

    • @DeltaStep
      @DeltaStep  6 лет назад

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  • @MKGamingWorld
    @MKGamingWorld 6 лет назад

    ok sir but you mean to say if density of medium increases the speed of sound decreases but if we compare the density of water and air then according to you in air the speed of sound will be fast but in really it doesn't happend

    • @feliwx4087
      @feliwx4087 6 лет назад +1

      You are actually right . but speed of sound doesn't depend on the density , but it depends on the elasticity and the rigidity of the matter . speed of sound is directly proportional to the elasticity of the medium , air has more elasticity . thus speed of sound is faster in air . if the solids are elastic speed of sound in them would be the fastest .

    • @DeltaStep
      @DeltaStep  6 лет назад

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  • @obaidullahkhan9512
    @obaidullahkhan9512 4 года назад

    Sir, why does there is more speed of speed of sound in solids which has more density than gases when you're saying that density is hampering effect of sound speed

    • @DeltaStep
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  • @milanrai6988
    @milanrai6988 2 года назад

    can you explain the relationship between speed of sound and density of gas medium at constant temperature where no expansion of gas is taking place?

    • @DeltaStep
      @DeltaStep  2 года назад

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    • @ismeetsingh2021
      @ismeetsingh2021 Год назад

      Inversely proportional speed of sound decreases by increase in density

  • @saimaasghar4566
    @saimaasghar4566 4 года назад

    Dear sir ee say that sound can movie through a solid medium but when we speak in closed room the person outside the room is unable to hear the voice.. thr how.....

    • @DeltaStep
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  • @santwanamukherjee5979
    @santwanamukherjee5979 7 лет назад

    Thanks for your fine way of spreading scientific facts among the masses. But I still have a query to you that how a common balance divide the small g i.e. acceleration due to gravity by itself?🤒🤒🤒🤒🤒🤒

    • @DeltaStep
      @DeltaStep  6 лет назад

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  • @tulsiram779
    @tulsiram779 6 лет назад +1

    Superb

    • @DeltaStep
      @DeltaStep  6 лет назад

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  • @HarishChoubey-hz7on
    @HarishChoubey-hz7on 9 месяцев назад

    Thankyou bhaiya

    • @DeltaStep
      @DeltaStep  9 месяцев назад

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  • @arshprasad8172
    @arshprasad8172 7 лет назад

    thanks for your help!!!

    • @DeltaStep
      @DeltaStep  6 лет назад

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  • @kaleemkm4965
    @kaleemkm4965 5 лет назад

    thank you sir.super sir.

    • @DeltaStep
      @DeltaStep  5 лет назад

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  • @rahulnarke5775
    @rahulnarke5775 2 года назад

    U said increase in density then sound velocity decreases the what about solid ...because solid has high speed of sound comparetively liquied and gas..why?

    • @rahulnarke5775
      @rahulnarke5775 2 года назад

      The molecule are closed packed in solid..so vibration can esily transfer..is this right or wrong

    • @DeltaStep
      @DeltaStep  2 года назад

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  • @zooziesharma1012
    @zooziesharma1012 2 года назад

    xavier entered the chat wuhu 🤠

  • @alizain3144
    @alizain3144 4 года назад

    If sound and wind are in same direction than the speed sound is greater how? For same direction mathematical it will b like that total speed of sound = speed of sound +wind speed so according to this we can't hear a clear sound

    • @DeltaStep
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  • @shwetamane6004
    @shwetamane6004 4 года назад +1

    nice sir

    • @DeltaStep
      @DeltaStep  4 года назад

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  • @harshtripathi5340
    @harshtripathi5340 4 года назад

    Thanks Sir ....

    • @DeltaStep
      @DeltaStep  4 года назад

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  • @surenbono6063
    @surenbono6063 5 лет назад

    what about its quality...music always sound better after rain/denser atmosphere...velocity do not matter here....in vacuum there is decresed quality of sound

  • @OdysseySoulful
    @OdysseySoulful 6 лет назад

    Which factors affect the speed of sound in water ?please make a video

    • @DeltaStep
      @DeltaStep  6 лет назад +1

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  • @KuldeepSingh-cj8ib
    @KuldeepSingh-cj8ib 5 лет назад +1

    one factor is missing that is nature of the medium and thanks for helping

    • @DeltaStep
      @DeltaStep  5 лет назад

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  • @zero._.error._.gaming.
    @zero._.error._.gaming. Год назад

    Thanks sir but lecture was slow.otherwise it was Good u

    • @DeltaStep
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  • @alphaman8769
    @alphaman8769 4 года назад

    Can you explain why frequency doesn't affect sound's speed

    • @DeltaStep
      @DeltaStep  4 года назад

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  • @abhinavkumar3638
    @abhinavkumar3638 Год назад

    Thanks

    • @DeltaStep
      @DeltaStep  Год назад

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  • @rakeshfilms9974
    @rakeshfilms9974 5 лет назад

    Thank you

    • @DeltaStep
      @DeltaStep  4 года назад

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  • @alankritshukla4689
    @alankritshukla4689 5 лет назад

    What about elasticity???

    • @DeltaStep
      @DeltaStep  5 лет назад

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  • @adebisiadedolapo1811
    @adebisiadedolapo1811 4 года назад

    Very good

    • @DeltaStep
      @DeltaStep  4 года назад

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  • @muskankukkar7187
    @muskankukkar7187 5 лет назад +1

    Hello there to random people scrolling down
    Please take a minute and tell me abt density part
    Please please😦😦

    • @DeltaStep
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    • @nileshgupta2981
      @nileshgupta2981 5 лет назад

      Formula for velocity of sound is √(Elasticity/Density) given by Newton.
      So for solids if Density is double then liquids or gases, Elasticity is almost four times. Hence Elasticity is dominating factor here hence overall velocity increases according to the formula.

  • @zooziesharma1012
    @zooziesharma1012 2 года назад

    that's lil Nas x so i want aaa someone to love me that's what i want !!!!! 😗

  • @anuradhakumaran3599
    @anuradhakumaran3599 3 года назад

    Good sir

    • @DeltaStep
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  • @Harendrasingh-zi4ci
    @Harendrasingh-zi4ci 6 лет назад

    Not understand well the concept of density
    As temp. Increases so density decreases and you tell velocity of sound increases ,, but before u tell that due to more no. Of molecules speed of sound travels faster but due to decrease in density moleculer distance is greater than previous so if molecules are at more distance than speed of sound has to be ddecrease.

  • @riteshkumar018
    @riteshkumar018 Год назад

    I cant understand this.
    You just said that when there is humidity there is more number of molecules so speed of sound increases
    But in the same way when density is more the molecule are more closed so speed should increase and at low density speed should decrease ?
    Isn't it ?

    • @DeltaStep
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    • @Itsyourchoice7
      @Itsyourchoice7 Год назад

      Yes bro that situation can't understand

  • @nirmalmanoj
    @nirmalmanoj 8 лет назад +4

    Nice explanation. But you're talking so slow

  • @thisara8404
    @thisara8404 Год назад

    • @DeltaStep
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  • @harveshkumar440
    @harveshkumar440 3 года назад +1

    No confusion now...

    • @DeltaStep
      @DeltaStep  3 года назад

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  • @naveenpaudel3382
    @naveenpaudel3382 8 лет назад

    Nice attempt.

    • @DeltaStep
      @DeltaStep  6 лет назад

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  • @letslearnbasics411
    @letslearnbasics411 5 лет назад

    Great

    • @DeltaStep
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  • @leilaly3078
    @leilaly3078 5 лет назад

    i want to know the equation of speed of soud with the effect of temperature and humidity

    • @DeltaStep
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    • @zooziesharma1012
      @zooziesharma1012 2 года назад

      @@DeltaStep we can't afford it lol !!

  • @nepevilgamer1561
    @nepevilgamer1561 Год назад

    Tqs

    • @DeltaStep
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  • @khyatijaincraft5284
    @khyatijaincraft5284 Год назад

    Helpful

    • @DeltaStep
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  • @vineetaverma1855
    @vineetaverma1855 10 месяцев назад

    😊

    • @DeltaStep
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  • @r.kphotostudiorajkumar9131
    @r.kphotostudiorajkumar9131 5 лет назад +1

    Nice ,but sound quality is not so good

    • @DeltaStep
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  • @ummeraasim9324
    @ummeraasim9324 11 месяцев назад

    🎉

    • @DeltaStep
      @DeltaStep  11 месяцев назад

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  • @roopamjha5046
    @roopamjha5046 Год назад

    But sir how can an air expand as it is a bad conductor of heat

    • @DeltaStep
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  • @ojasrane1414
    @ojasrane1414 6 лет назад

    U are best

    • @DeltaStep
      @DeltaStep  6 лет назад

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  • @switchyblade7861
    @switchyblade7861 2 года назад

    ty

    • @DeltaStep
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  • @Abhishekkumar005
    @Abhishekkumar005 2 года назад

    Density of solid is higher than gas but sound moves faster in solid. Why ??

    • @DeltaStep
      @DeltaStep  2 года назад

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  • @noureenatta686
    @noureenatta686 2 года назад

    What about pressure?

    • @DeltaStep
      @DeltaStep  2 года назад

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  • @harishankarkarthik3570
    @harishankarkarthik3570 3 года назад

    AMAZING

    • @DeltaStep
      @DeltaStep  3 года назад

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  • @mithleshmaxx9942
    @mithleshmaxx9942 6 лет назад

    But sir the sound go long distance in night whereas the tempreture is low than the day

    • @MKGamingWorld
      @MKGamingWorld 6 лет назад

      due to refraction

    • @MKGamingWorld
      @MKGamingWorld 6 лет назад

      and second thing in night there is more temp cause earth become hot at day but in night it reduces its temp so that temperature goes into air and make the area more hot

  • @blanque4250
    @blanque4250 8 лет назад

    what about elasticity?

    • @ismeetsingh2021
      @ismeetsingh2021 Год назад

      Stress / strain

    • @ismeetsingh2021
      @ismeetsingh2021 Год назад

      F/a ÷ increased length / original length but the temperature is constant in normal conditions.

  • @bsftv1
    @bsftv1 5 лет назад

    Speed

  • @umakantsabnis9293
    @umakantsabnis9293 5 лет назад

    good

    • @DeltaStep
      @DeltaStep  5 лет назад

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  • @anil4121
    @anil4121 6 лет назад

    What about pressure dude

    • @MKGamingWorld
      @MKGamingWorld 6 лет назад

      there is no effect on speed of sound due to pressure

  • @xyz-vx4sl
    @xyz-vx4sl 8 лет назад

    good job...

    • @DeltaStep
      @DeltaStep  6 лет назад

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