Atomic Structure: Discovery of the Neutron

Поділитися
Вставка
  • Опубліковано 18 гру 2024

КОМЕНТАРІ • 428

  • @tdewitt451
    @tdewitt451  11 років тому +40

    Everything should seem like a piece of cake when you're first learning it. Why don't you want this basic information to be easy for students? I agree complex particle physics is hard. If a student understands the basics and likes it, they'll go on later to study the more complex details--maybe they'll become a particle physicist! But if they hate it when they first learn it because it's so impossible to understand, I guarantee they'll *never* learn more.

    • @hasankaiser4563
      @hasankaiser4563 5 років тому

      tyler why was it deemed the radiation was neutron

    • @shubham9a416
      @shubham9a416 Рік тому

      You are not only a teacher but also the poor students' (like us) guide and motivation.

  • @zelucasrf
    @zelucasrf 8 років тому +112

    OMG, I can learn more Chemistry and english, together, well done! Thanks!

  • @chrish6780
    @chrish6780 9 років тому +312

    I learn more in these than in school.

    • @lekhbhatia8185
      @lekhbhatia8185 7 років тому +4

      ikr

    • @anaccount766
      @anaccount766 7 років тому +1

      ikr than i need tutorials

    • @aaronnava9941
      @aaronnava9941 4 роки тому +1

      It's because he's not boring. A lot of these teachers are boring af.

    • @ballistiklekent6541
      @ballistiklekent6541 4 роки тому +6

      I feel it's more to do with the environment, your able to watch this at home or whenever you choose

    • @totalrecall1358
      @totalrecall1358 4 роки тому +1

      @@ballistiklekent6541 ^ I agree

  • @tdewitt451
    @tdewitt451  11 років тому +16

    Hey everyone, I'm here to help. If you have any questions or just want to learn more, click on the link in the description above. It'll take you to a page where you can ask me questions.

  • @johaovilcarino1559
    @johaovilcarino1559 9 років тому +48

    You're sincerely the best when it comes to explaining, you should definitely replace my teacher. Thank you, we all really appreciate it. Keep doing what you're doing. Glad to have found your channel.

  • @gyan-vigyan-kmc
    @gyan-vigyan-kmc 2 роки тому +32

    Love from INDIA by the help of Arijit daripa sir of Edu Point on UA-cam

  • @khushisingh2163
    @khushisingh2163 3 роки тому +20

    Still helpful in 2020 more than school or any teacher...❤️❤️ Thanks for being on UA-cam 😭😭

  • @anuskasampath5652
    @anuskasampath5652 11 років тому +10

    this was amazing , I've been reading the same information in my text for hours now and was not able to comprehend nearly as i did when i watched this video , i understood everything the first time looking at it , thank you so much for making it this easy ! looking forward for more videos :)

  • @DiptoSalam
    @DiptoSalam 4 роки тому +6

    PLEASE START MAKING THIS CONTENTS AGAIN!❤️
    When this video came out I was merely a baby!
    LOVE FROM BANGLADESH 🇧🇩
    I now read in 11 th grade and I love chemistry.It is wonderful to know this awesome things living thousands of kilometres away from you.

  • @nasreenmirza5712
    @nasreenmirza5712 8 років тому +15

    you are the best chemistry teacher. thanks for these awesome videos.

  • @coldcat021
    @coldcat021 2 роки тому +1

    The way you teach is so easy and systematic.....all things just link together..... Best explanation!

  • @cheesecake7101
    @cheesecake7101 8 років тому +33

    omygod i have a report of this tomorrow and u basically saved my life

  • @raraoohlala1893
    @raraoohlala1893 9 років тому +4

    I am so glad I found your channel. I was lost in class but you have given me hope.

  • @moonissou
    @moonissou 12 днів тому

    One of the things I really like about this guy
    Is his language
    So clear
    Easy scientifique words
    So direct
    Like he is talking with kids learning those things for the first time (that's exactly what we we are)
    Thank you sooo much !!!!

  • @XxelitebeautyxX
    @XxelitebeautyxX 9 років тому +3

    So glad that I found your channel, by seeing your hands I can say that you was totally involved in teaching the stuff.
    Great tutor !

  • @letsmakeiteasy3161
    @letsmakeiteasy3161 10 місяців тому +1

    I don't understand why only protons are coming out from paraffin as neutron can heat other neutron or electron and can kick out those from wax. 2nd That fast moving neutrons of Boron can even come out through empty space of atoms of wax.

  • @jozseforgovan8621
    @jozseforgovan8621 9 років тому +28

    thank you much-you are very good -slow and detailed. congratulations to you. very understanding and easy to see through what you demonstrated about neutrons. very good.

  • @mattk183
    @mattk183 2 роки тому +1

    Oh WOW i had no idea about this! The drawings made it so clear! My chemistry teacher sees that I know so much and she gives me more advanced work. Tyler, the amount of times I watch you is 90% and the amount of times I listen and see my chemistry teacher in a year is 10%. That shows that you are more better than my teacher.

  • @insookim2555
    @insookim2555 10 років тому +1

    Please be my chem teacher I'm learning more from your videos than I have in class the past month

  • @milindbebarta2226
    @milindbebarta2226 8 років тому

    You're the best teacher by a good margin on UA-cam.

  • @michaelmurdoch
    @michaelmurdoch Рік тому +1

    Thanks! My textbook didn't explain it and I was curious, love your chem vids!

  • @tortureh2371
    @tortureh2371 6 років тому +24

    Can anybody answer this : Why does bery/boron foil send out neutrons ? why couldnt it send protons as both as positive it should repel and proton should come out why doesnt it ?Why does proton come out of Paraffin wax ?Why was it chosen?

    • @hol9619
      @hol9619 5 років тому

      tbh

    • @tortureh2371
      @tortureh2371 4 роки тому +1

      Well I don't even understand the question now lel

    • @ranjana6664
      @ranjana6664 4 роки тому +4

      Yess,, I also have these doubts but nobody is understanding my these doubts 😟😟

    • @grimsobad8545
      @grimsobad8545 4 роки тому

      MR. SWÂG makes a lotta sense now as I thigh it would like ya know clash

    • @swetachatterjee464
      @swetachatterjee464 4 роки тому

      Same doubt...

  • @user-qm7io9kn7k
    @user-qm7io9kn7k 5 років тому +4

    3:44 How could it be balanced out? *Doesn't Hydrogen also have neutrons, or were they using protium?*

    • @rana000
      @rana000 5 років тому +1

      Right bro why balance hydrogens that helium

    • @achsas6280
      @achsas6280 5 років тому

      Hydrogen doesn't have neutrons

    • @rana000
      @rana000 5 років тому

      @@achsas6280 so nucleus want to be attracted by the electron and fall in electron but this is not possible

    • @achsas6280
      @achsas6280 5 років тому

      Hydrogen have one electron and one proton but nothing is attached because there's another power stronger that the attraction force.

    • @rana000
      @rana000 5 років тому

      @@achsas6280 another power means.which one is another power?

  • @bigdaddytruck3647
    @bigdaddytruck3647 2 роки тому +1

    So glad my teacher put a link to this on the powerpoint

  • @HaileyC201
    @HaileyC201 12 років тому +2

    I wish you were my Chem teacher! Thank you so much!

  • @salmaashraf6246
    @salmaashraf6246 9 років тому +4

    Your explanation is perfect

  • @khushiseth3081
    @khushiseth3081 4 місяці тому

    You're the reason I'm starting to find chemistry interesting! Thank you so so much

  • @KaranSingh-ut8cq
    @KaranSingh-ut8cq 8 років тому +15

    Thank you sir an incredible video
    A question... Why protons would not get shot out of lithium boron or beryllium... Why nutrons??? Because i think +,+ repel so alpha particles and protons repel and that should displace protons from beryllium lithium or boron
    And also i am curious to ask that what happens to that matter(parafin) after getting its protons out.... I mean its mass or shape or state of matter or something that might haappen to it ???

    • @satellitesage2487
      @satellitesage2487 8 років тому

      Same questions

    • @pjjacobh9570
      @pjjacobh9570 7 років тому

      Helium nuclei isn't neutral, it has 2 protons and 2 neutrons and needs 2 electrons so it's doubly charged .

    • @pragyanpandey634
      @pragyanpandey634 7 років тому

      Neutron is neutral and 2 protons will cancel out the charge of 2 electrons.Therefore making it's K shell complete and a noble gas.

    • @ekodaoriginals7104
      @ekodaoriginals7104 6 років тому

      Pragyan Pandey protons cancelling out means its losing its paraffin wax identity (??!) cuz proton is what that is the most fundamental particle of an atom and if it gets discharged, the wax perhaps turns into something else rather than wax. Here electrons were not shot out therefore, there won't be filling up of any K shell and turn into noble gas or something. Besides, wax is a hydrocarbon?

    • @ekodaoriginals7104
      @ekodaoriginals7104 6 років тому

      That's a smart question, even I wonder, how could he become so sure that it was neutron shooting out, not proton cuz proton-proton repulses and there's a very chance that if protons are shot out then it's gonna have the same action done by neutron kicking out the protons. And the second question of yours, since wax was losing its protons I think it's gonna turn into some other element or at least so like it as proton gives an atom its identity. But again, since it's a complex hydrocarbon, I can't be so sure about it and perhaps, it converts into some other hydrocarbon.

  • @jenzhg
    @jenzhg 3 роки тому +1

    I was wracking my brain over his experiment for an hour or so and you literally just cured me in 10 minutes, YOU'RE AMAZING

  • @NethraManisha
    @NethraManisha Рік тому

    This is class 11 chemistry
    Now I am 15yrs old This video was uploaded 10yrs before form now that means when I was 5. I was thinking about this how old this video was but good quality and better explanation I had never seen

  • @staytube4572
    @staytube4572 3 роки тому +2

    thank you so much sir .... your videos help me a lot to learn chemistry. really appreciate your dedication. And I understand the concepts clearly.

  • @stevenakpan783
    @stevenakpan783 4 роки тому

    My best teacher ever. please make more videos, im begging of you

  • @bharathchandra3436
    @bharathchandra3436 7 років тому +24

    But I really have a doubt
    How can Alpha particles kick out neutrons from the 'Be' or 'B' or 'Li'?
    How can neutrons kick out protons from Wax?
    First of all Why did Neutrons come out?

    • @kaustavsengupta8757
      @kaustavsengupta8757 6 років тому +13

      I know it's kinda late to answer but I will try to give answer as short and easy as possible. Well in late 1900 scientist were curious about what are the forces and how they interact with each other. With loads of excellent contribution of various scientist it was determined that in our universe 4 force are present i.e 1. Strong attraction force(nuclear force) , 2. Gravitational force, 3. Electromagnetic forces and last but not least is 4. Weak nuclear force. As per you question alpha particles kicked out of neutrons is because of weak nuclear force.
      Let me explain every element consistent of proton and neutrons, since all positive charge always repel each other so atom nucleus can't stable right??..No here comes the neutrons to save, you can think of neutrons as charge less but it also acts as cushion so that protons can stay together without rupturing the atoms nucleus. As the heavy the element goes so does the number of protons increases as well as neutrons too. Now comes the trick, there are sometimes when so much positive charge is condense into small space(atom nucleus) that it tend to become unstable due to repulsive force of proton. Since all things in the universe follows law of conservation of energy, to stabilize itself atom nucleus realease energy in form of radioactive (alpha particles, beta, or gamma).
      Fun fact take example of Uranium. We know Uranium have 2 major isotopes U238 and U-235. U-238 is relatively much stable than latter as it have more neutrons i.e more cushion and glue (stability), where as U-235 have 3 neutrons less and since less cushion and more positive-positive repulsive force which leads to its higher instability and high radioactive.
      Hope this answers your questions

    • @kaustavsengupta8757
      @kaustavsengupta8757 6 років тому

      @@zakcullen6124 Just to be sure, you want to know how scientist determine that given radioactive decay is by which form i.e alpha particle decay, gamma or beta? Is that your question?

    • @kaustavsengupta8757
      @kaustavsengupta8757 6 років тому

      If you want to know whether decaying is from alpha particle or beta. I think it will be better if you search Wilson Cloud Chamber on UA-cam, I think you will find answer of your question. It will be easier for you to watch rather than reading description analogue of mine.

    • @kaustavsengupta8757
      @kaustavsengupta8757 6 років тому

      @Joseph Park Naah not really there is difference for nuclear explosion you need to have sustainable instantaneous release of all energy. I will advise you to go and check out "Critical Nuclear Mass" on UA-cam or Google. You will come your answers. As far as my interest is concern, yes I have master in molecular biology and we all the time uses small radioactive isotopes to carry out study experiment. If you really want to know how molecular biologist use radioactive isotopes then I will suggest you watch experiment "Hershey-Chase Bacteriophage Experiment" as it is basic of radioactive experiment carryout inside the cell body
      Moreover python is great for data analysis and for its predictive method machine learning, so we try to use this to effectively collect data of amino acid and other chemical signal and try to make a predictive it's movement through python libraries.

    • @sidewaysfcs0718
      @sidewaysfcs0718 6 років тому +2

      @Joseph Park No. To cause a nuclear explosion you need a nuclear chain reaction above critical mass to reach explosive kinetics.

  • @valg6280
    @valg6280 10 років тому

    Thank you so much for explaining this! You're tens times better at explaining things than my Chemistry teacher.

  • @abdullahabro9862
    @abdullahabro9862 9 років тому +1

    Too good and easy approachable lecture delivered by you.............. i am not even english speaker but despite it was too easy for me to handle your lecture as compared to others i found on youtube..... thumbs up....(y)

  • @radiantnet7443
    @radiantnet7443 5 років тому

    These vids are soo helpful I recommend them when I hear someone needs help

  • @sunitarawat9012
    @sunitarawat9012 3 роки тому +1

    Sir you are superhero for me.....
    Love from India🇮🇳🇮🇳🇮🇳....

  • @aryangodara8538
    @aryangodara8538 2 роки тому +2

    To get this such a beautiful content is not less than a boon....
    Love u a lot sir❤️❤️
    I am Indian and there is a channel who made a video on this topic and instead of taking the credit he told all the audience that all credit goes to U nd I didn't expected that this content could be so much beautiful....
    Totally awesome sir
    Their Channel name:- EduPoint
    Love you a lot sir💕💕

    • @Ethan_asoldier
      @Ethan_asoldier 2 роки тому

      Me too, I have come from the link of Edupoint

  • @hj008
    @hj008 Рік тому

    Don't forget to say that a Peruvian physicist Antúnez de Mayolo proposed the existence of the neutron eight years before its discovery. Btw, thanks for your awesome videos.

  • @kunalchandel6661
    @kunalchandel6661 4 роки тому +3

    Love from India ❤️❤️❤️❤️❤️

  • @firaca100
    @firaca100 5 років тому +1

    What a really good video! I hope that I can meet your video earlier when I was in high school !
    Very well narated and good explanation!

  • @simarjeetkaur4667
    @simarjeetkaur4667 5 років тому

    I love to watch your videoes as they are concept clearing

  • @rahgirtanvinchowdhury2252
    @rahgirtanvinchowdhury2252 3 роки тому +1

    Actually reading the book of chang, I remain a little confused, but after watching your videos, I become completely clear. Thanks for your nice videos.

  • @theramblingreviewer5150
    @theramblingreviewer5150 5 років тому +2

    Excellent video! Thank you for your clear explanation that really helped to give an understanding of the underlying mystery these scientists like Chadwick were trying to answer and how they answered it.

  • @thegalacticgamer6455
    @thegalacticgamer6455 3 роки тому

    Brilliantly explained, helped enormously in one of my research tasks.

  • @ganeshsekhar6162
    @ganeshsekhar6162 9 років тому +12

    what does paraffin got in particular??...although there must be something which made chadwick to place paraffin infront of the radiation !!

    • @internationalremixes6440
      @internationalremixes6440 7 років тому +2

      in some texts, you can have light nuclei written over then, like helium's, carbon's or nitrogen's!

    • @samk6042
      @samk6042 5 років тому +2

      So paraffin is a long chain hydrocarbon which essentially is rich in hydrogens

    • @krishvanshknu6889
      @krishvanshknu6889 5 років тому +2

      i think bcoz parrafin cant show photoelectric emission when hited by electromagnetic waves

    • @njmullins
      @njmullins 4 роки тому +3

      @@krishvanshknu6889 paraffin shows tracks/scratches if something massive hits it. The release of p+ was a surprise at first. the assumption was that the unknown particles would embed into the paraffin. the resulting push told us of the equivalent force being transmitted through the paraffin. apparently the energy released by the alpha collision released neutrons of very high KE, which was sufficient to eject the p+

    • @fatimalearns9618
      @fatimalearns9618 3 роки тому

      @@njmullins Thanks for the reply! It helped me too.

  • @econguyph
    @econguyph 4 роки тому

    road to 1M subscribers! You deserve it, Kudos

  • @ayushsachdeva3051
    @ayushsachdeva3051 7 років тому +1

    Hey, Tyler.
    Just a question.
    Why would the neutrons strike out the protons of the paraffin?
    I mean the probability that a randomly striking neutron would strike such a small nucleus is tiny.
    Thanks in advance and also for teaching all this stuff.

  • @Ghost572
    @Ghost572 12 років тому

    I just wanna say I really enjoy your videos and you have a great way of explaining things keep up the good work!

  • @mangakhandavalli9881
    @mangakhandavalli9881 4 роки тому +1

    I am telling that I am so lucky to have nice explanation by Tyler dewitt thanks tylerdewitt bro nice explanation

  • @deepakfialok
    @deepakfialok 7 років тому +1

    Absolutely genius of you to explain these concepts.... keep the good work going :)

  • @SeetaJoshi-zj3hi
    @SeetaJoshi-zj3hi 8 місяців тому

    Sir you are the best teacher in the world. I beg you to please launch a chemistry course program for JEE students

  • @riazijabar5296
    @riazijabar5296 Рік тому +1

    He made me love chemistry ....

  • @vivekrnajan8594
    @vivekrnajan8594 4 роки тому +2

    Sir plz make more videos like this plz sir ,we all miss you sir 🙏🙏🙏

  • @jemappellelanoosh1743
    @jemappellelanoosh1743 12 років тому +3

    Ohh you are a greattt teacher :-) Thank you so much for your time and effort !

  • @momentsofgaming468
    @momentsofgaming468 3 роки тому

    After seeing thing we come to know that... What you need is a mentor like this to think that what was actually happened to do such discoveries..... Love from India 🇮🇳🇮🇳

  • @ronwynjacob6339
    @ronwynjacob6339 8 років тому

    doing a project on James Chadwick, this helped sooo much!
    ~thanks

  • @foolingaround9348
    @foolingaround9348 Рік тому

    Thank you so much you saved me
    The education of pharmacy in Algeria was in French until this year. I was struggling to find resources to study in English ❤😊

  • @AyushGulloo
    @AyushGulloo Рік тому

    I liked the way of explaining complex theories

  • @evanchauhan7661
    @evanchauhan7661 11 років тому

    Definitely worth 10 minutes thanks man

  • @raissatwiringiyimana5179
    @raissatwiringiyimana5179 10 років тому

    here I got question
    1.which material do they use to shout those alpha particles?
    2.neutrons have to have the same mass as protons or they can be more than that of protons in order to shout them?

  • @16meerab76
    @16meerab76 3 роки тому

    IDK why he speaks so confidently making me feel he has worked with the scientists and know each and everything

  • @9670209806
    @9670209806 5 років тому +1

    Hey Tyler, this is nice explanation. I have a little confusion. That how it is discovered that the radiations coming from Be after Alpha-bombardment is of neutral in nature. Have they checked the deflection By applying electric field??

  • @anushkagupta3901
    @anushkagupta3901 3 роки тому

    Loved your method of illustrating and teaching ✌🏻

  • @studylife01
    @studylife01 2 роки тому

    thank you very much.
    I use this for understanding the test of discovering the neutron.
    I'm also glad to found your channel!

  • @navinsibi9185
    @navinsibi9185 8 років тому

    best teacher in the world is you sir according to me

  • @jiakhan4061
    @jiakhan4061 8 років тому

    found the legendary teacher on this planet... .
    hat's off to you sir
    stay happy...

  • @hayliewu9604
    @hayliewu9604 7 років тому

    thank you so much!! I hope schools can teach like you but they don't really teach

  • @ahmaad3985
    @ahmaad3985 5 років тому

    Great work I am from India but our teachers never teached like you

  • @usha8541
    @usha8541 2 роки тому +1

    very nice explanation❤

  • @robinjohnson9611
    @robinjohnson9611 7 років тому

    just thought i'd say..Sir James Chadwick is my 2 or 3 time great grandfather on my mom's side...makes sense...my brother wanted to be an astrophysicist....pretty interesting stuff..

  • @mayar4240
    @mayar4240 3 роки тому

    Thank you so much you make this lesson sooooo esay for me .

  • @ln9456
    @ln9456 7 років тому +1

    really like your videos, they r very clear to me

    • @bizunehbecho9163
      @bizunehbecho9163 3 роки тому

      You need me .and also i am chem teacher.please attach ur email i am bizuneh becho

  • @jaishriramjaishrikrishna
    @jaishriramjaishrikrishna 3 роки тому

    Thanks for this explanation. I have come here when a Indian educator suggested us to go to your channel.
    EDUPOINT.
    Love from 🇮🇳India

  • @reincarnation420
    @reincarnation420 4 роки тому

    You teach better than anything or anyone
    Keep it up 👍

  • @umairahmedqureshi3156
    @umairahmedqureshi3156 2 роки тому

    Very comprehensive lecture

  • @altabrza8658
    @altabrza8658 4 роки тому

    Wow your way of teaching is very near nice 🥰🥰🥰

  • @tinder221
    @tinder221 4 роки тому

    i subbed just because I feel like this guy deserves 1 mil

  • @fatimalearns9618
    @fatimalearns9618 3 роки тому +1

    Why the neutrons only shoot out protons and not neutrons present in the paraffin?

  • @anasali90000
    @anasali90000 4 роки тому

    Very well explained.Thank you Tyler for enlightening hungry brains

  • @wafawiwio112
    @wafawiwio112 9 років тому +1

    thnk u so much but i have one qq why did he use paraffine and non other thing???

  • @examxl1677
    @examxl1677 8 місяців тому +1

    Love from India 🎉

  • @sadiatasnim3034
    @sadiatasnim3034 4 роки тому

    Why hydrogen don't have proton ??????......4:23 plzz reply m confused

    • @tanmay_bhanushali
      @tanmay_bhanushali 4 роки тому

      Because there's only one proton in hydrogen atom so there's no repulsion and therefore noting is required to hold proton together......

  • @merttok4291
    @merttok4291 11 років тому +1

    Thanks man!
    Also, I can translate these videos for you if you want!

  • @quickholidaysltd
    @quickholidaysltd 6 років тому

    Best amongst others ! You are the man who made me interested in chemistry ,which I thought be the most booring subject .Hats of to you!Man......

  • @SNeili1
    @SNeili1 3 роки тому

    Why were atoms of beryllium boron lithium used? Could that have been any atoms, e.g gold foil like in Ruthefords experiment?

  • @karamalsqoor7292
    @karamalsqoor7292 11 років тому +1

    Thank you for your wonderful efforts I am very like your lesson and you understand

  • @shlomomuller6916
    @shlomomuller6916 3 роки тому

    Did the 1910's model include multiple protons in the nucleus? Or was that only believed post the 1919 report from Rutherford about hydrogen nuclei being a component part of the nucleus of nitrogen?

  • @umasubu1
    @umasubu1 11 років тому

    When Lithium and Beryllium atoms were hit by alpha rays Electrons came out, then what happens to the lithium atom.does it collapse in the absence of neutrons. Also during Rutherford Gold foil experiment when the God foil was hit by alpha rays did Neutrons come out???

  • @shrt2587
    @shrt2587 4 роки тому

    This video really helped me in understanding the concept
    Thank you so much

  • @hemanivetytha4679
    @hemanivetytha4679 7 років тому

    excellent explanation thanks.plz show some animation also

  • @aarushiagarwal2321
    @aarushiagarwal2321 3 роки тому

    Absolutely helpful explanation , but if i may ask , why are only the protons getting shot out of the atoms , and why only of paraffin wax , any possible explanation would be very helpful !..

  • @Mechatronicx
    @Mechatronicx 11 років тому

    u r a legend :) very interesting ways to explain critical things

  • @krimsonstriker6113
    @krimsonstriker6113 4 роки тому

    Could you make another video more specifically explanation

  • @mr-smartchoice
    @mr-smartchoice 2 роки тому

    School will never give you full details like this

  • @smallbeginnings3497
    @smallbeginnings3497 3 роки тому

    If the rays doesn't have charge,should we say that it's a radiation? 7:25

  • @cormyat07
    @cormyat07 4 роки тому

    Very cool demo, but I'm curious why neutrons don't also come shooting out of the parafin wax?

  • @yasanduseneviratne1469
    @yasanduseneviratne1469 4 роки тому +1

    What a teacher!!!!!!! Thank u so much

  • @destructorgaming8870
    @destructorgaming8870 3 роки тому

    Thank you sir, now I am able to understand very well. Awesome video

  • @Leloaapkadilhai
    @Leloaapkadilhai 4 роки тому

    I love this channel it's helps me a lot love from india 🇮🇳 sir 🤗