How Heinrich Hertz Discovered Radio to Validate Maxwell's Equations

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  • Опубликовано: 31 дек 2024

Комментарии • 196

  • @Kathy_Loves_Physics
    @Kathy_Loves_Physics  6 лет назад +95

    Correction: At the end of the video I mention that Tesla went to Paris for the World's Fair 5 years after Hertz died. He actually went 5 years *before* Hertz died. Sorry, I blame my small children for all of my mistakes :)

    • @Greg_Chase
      @Greg_Chase 3 года назад +2

      There is much jealousy among very intelligent, competitive, proud, vain people. A lot of jealousy. It is very suspicious that Hertz died in this manner - it is not without possibility that he was poisoned. It seems very odd that he became ill **after** his discovery was published and taking the Director of Physics job at the young age of 32.

    • @daleeasternbrat816
      @daleeasternbrat816 3 года назад +1

      Kathy: what Dr. Felton does for history you do for Physics. I am facinated by these things since very early childhood. I now work in the field of power generation and control including marine and industrial diesel and control and power managemen I also design ang build custom equipment for this market, including alternative energy. . I am lucky I didn't electrocute myself or burn down the house when I was a kid! You present these videos in a magnificent way , dense packing information in minutes that took much time and effort to learn. You are planting the Seed Corn of a crop of future Engineers and Physicists here. I most certainly wish these vids were available in 1964 when I was eight. I would have gobbled them up as eagerly as I do now! But I made do with old US Navy manuals that are almost as good as your vids. They also presented the history and theory behind the development of the technology we use. They are Very Well Written and Illustrated. I was lucky to find and get a hold of them! Your Brilliant Vids Are Even Better! I Really wisk I had access to these when I was a kid!!! WOW!

    • @fare2muddlin
      @fare2muddlin 2 года назад

      @@Greg_Chase Are there any suspects? Could he have ‘zapped’ himself? How many electrochemical/physics researchers were injured because of lack of safety precautions?

    • @Greg_Chase
      @Greg_Chase 2 года назад +1

      ​@@fare2muddlin Considering his young age at which he attained a fairly prestigious career position - and had made the breakthrough at proving Maxwell's "electromagnetic waves must exist" idea - and also considering the intellectual toil and dead-ends suffered by most scientists - I feel safe in speculating that his early demise may not have been natural. The timing of it is the noteworthy part. After he developed the first wireless transmitter experiment that could be duplicated and shown to be correct by others. After attaining a fairly prestigious career position. But no way to know for sure.
      Having tea several times a week with a jealous colleague once he was settled in his new position. Was their opportunity to get at him? Probably. But we just don't know.

    • @jackjudy6285
      @jackjudy6285 2 года назад

      I blame my mistakes on my small child mentality, wait.... What?

  • @EUC_Senior
    @EUC_Senior 4 года назад +34

    You are a wealth of information. It's a pleasure watching you explain things. Thank you!
    Mark

  • @jmchez
    @jmchez 4 года назад +39

    Up until now, I thought that Hertz was weirdly inept or lazy. He discovered radio waves and didn't think of the radio, he discovered the photoelectric effect and didn't follow up like Lenard did. Why? Oh, he died tragically young.
    Thanks Kathy, I would not have looked up his life and learned more about him if it hadn't been for you. I now have much more respect for Hertz.
    If only the History Channel were the way they used to be instead of making programs about extraterrestrial aliens, they would do what you are doing. Keep up the good work.

    • @Kathy_Loves_Physics
      @Kathy_Loves_Physics  4 года назад +11

      I am so glad I could introduce you to how amazing Hertz was, I am still sad about his early death. And I agree about the History Channel, used to be so good. Sigh.

  • @MrJerwid
    @MrJerwid 5 лет назад +24

    Thanks for all these history episodes about electricity, they are so interesting and entertaining! M.S.E.E Widmark

  • @annagizziatlas62
    @annagizziatlas62 3 года назад +7

    The analogy to a vinyl record helped me understand radio waves. I definitely was confusing them with sound waves. Thank you!

  • @dalsenov
    @dalsenov 11 месяцев назад +1

    Very informative! Many thanks! I don't know exactly what's more beautiful: the science or the history of science!

  • @philliberatore4265
    @philliberatore4265 3 года назад +2

    Kathy, I have officially fallen into the rabbit hole of your videos. Thank you for making these.

  • @maxxie878
    @maxxie878 6 лет назад +11

    It's really interesting to see how this story extends between figures you normally don't even think about together (from Heinrich to Tesla). I'm enjoying these videos.

    • @Kathy_Loves_Physics
      @Kathy_Loves_Physics  6 лет назад +4

      I'm glad you like the videos. I am constantly surprised with the links that I have found! I am thinking I should have called it "Links in the History of Electricity" or "Electric Connections" or something. When I am done with the videos I will try to publish a book with all of the material and maybe I will rename it. (ps. Did you watch the Faraday and Maxwell videos?)

    • @Kathy_Loves_Physics
      @Kathy_Loves_Physics  5 лет назад +1

      @yesca jasta I did

    • @lawrencedoliveiro9104
      @lawrencedoliveiro9104 2 года назад

      “Connections” immediately brings to mind James Burke’s multiple series of the same name from the 1980s. And along very similar lines ...

  • @larslover6559
    @larslover6559 2 года назад +1

    I love your channel! Learning about the OG's in electricity is sooo fascinating.Hertz's "Electromagnetic waves were of no use whatsoever" must be the mother of all understatement.

  • @Robinzano
    @Robinzano 3 года назад +2

    The way you explain physics is fantastic. I can (and do) watch your videos all day long.

  • @juangarcia-kq8zp
    @juangarcia-kq8zp Год назад +1

    These kinds of inventors have been my heroes since my childhood.

  • @jenko701
    @jenko701 Год назад

    All your videos are pure gold , I love them .

  • @aidabug2829
    @aidabug2829 Год назад

    Thank you for making this video. I have been looking all over the internet for info on electromagnetic waves.

  • @iyadindia862
    @iyadindia862 4 года назад +3

    This channel was one among I was searching For..
    I really loved the content chosen..
    The way of presentaion..
    Combining History and Physics..
    And Thank you 😍😍

  • @gwernette5971
    @gwernette5971 2 года назад +1

    Thank you for putting these videos in plain terms. Growing up we rarely had practical explanations in school to stimulate our interest.
    Your videos remind me of another series called, The Secret Life of Machines. A couple of English guys explain the history of home and office technology.
    Thank you for all your time and effort that you've invested for the benefit of the public.

    • @Kathy_Loves_Physics
      @Kathy_Loves_Physics  2 года назад +3

      That show was fabulous! I especially love one they had on radio. Thank you for the compliment.

  • @srayes1001
    @srayes1001 2 года назад +1

    Struggling to keep up with the wave of videos haha. You're very wise and wonderful.

  • @edumation
    @edumation Год назад +1

    Although I teach electromagnetics and I have been involved with this field for 30 years, your explanation is attractive and must be very useful to learners. I always like to listen to others explaining this immortal topic!

  • @ionescunicolae473
    @ionescunicolae473 3 года назад +5

    Wow ! I am impressed ! Very interesting ! Very well and attractive explanations ! I like every episode ! Now I am a new subscriber ! Continue making these hystorical explained episodes
    (I salute you from Romania -east Europe)

  • @ricsanders69
    @ricsanders69 2 года назад +1

    Beautiful! I'm an Amateur Radio operator and am so glad that they renamed the unit of frequency measurement after Mr. Hertz...so instead of megacycles, we use megahertz! A lot of the old hams still say MC's instead of MHz!

  • @skyhester9196
    @skyhester9196 2 года назад +2

    Even though it's not the focus of the video, I think Kathy's explanation of how a vinyl record works is VERY good. Very simple and concise while being completely accurate.

    • @Kathy_Loves_Physics
      @Kathy_Loves_Physics  2 года назад +2

      Thank you. It’s a simple device that no one bothers to explain which I find frustrating as most people don’t know how it works.

  • @Palau_Legend
    @Palau_Legend Год назад

    Wow. I absolutely love your story telling. I have always loved this part of history!

  • @nc7341
    @nc7341 3 года назад

    I was glued to your presentation all along, and thanks.

  • @dongato6838
    @dongato6838 4 года назад +3

    Great video. Just came across your channel and am enjoying it. To quote Helmholtz: 'Bravo!'

  • @TheLuminescentGrand
    @TheLuminescentGrand Месяц назад

    Wow this was so wonderful, you are wonderful! Thank you!

  • @otiebrown9999
    @otiebrown9999 4 года назад +4

    Kathy -
    An excellent detailed report.
    Thanks!

  • @8008998502
    @8008998502 2 года назад

    Its really feeling awesome to watch your videos, great work done by you for mankind. Thanks a lot.

  • @Letemcook514
    @Letemcook514 Год назад

    What a great depiction, thank you. You truly are a guiding light in this world of darkness

  • @radeonblue1816
    @radeonblue1816 6 лет назад +2

    I will not download these awesome videos but will keep seeing again and again.

  • @AxcelleratorT
    @AxcelleratorT 4 года назад +12

    Hertz: "Reallized that most of what I've found so far is already known."
    Ahh that's the story of my life!

  • @fredsmit3481
    @fredsmit3481 2 года назад

    Thanks Kathy! I've learned a lot from you and I love your enthusiasm and the way you present the information.

  • @CharlesCarlsonC3
    @CharlesCarlsonC3 6 лет назад +2

    The hits just keep on coming!

  • @robertjohannnewton7489
    @robertjohannnewton7489 Год назад

    I enjoyed this video. Thanks for posting. I am now a subscriber.

  • @jamesslick4790
    @jamesslick4790 3 года назад +1

    I got a charge (pun intended..) when you explained that radio was NOT music. Most people have a very narrow idea of what radio is: broadcast AM or FM. I had someone "brag" that he didn't listen to the radio anymore. All the while he was playing Spotify over a Bluetooth speaker. I didn't bother to explain to him that a Bluetooth speaker was very much a type of radio receiver, so he WAS in fact "listening to the radio"! LOL.

  • @monange5290
    @monange5290 3 года назад +1

    thank you so much for this kathy! this helped me understand this topic even more! blessings & peace to you

  • @stephenirwin2761
    @stephenirwin2761 3 года назад

    I cant stop! I’ve got to see the next one!

  • @saurav8406
    @saurav8406 Год назад

    I always wanted to know the history of scientific development , and being a science student ,this is one of the best place i got this,this will help me a lot for development of my scientific understanding, thank you for such an amazing explanation

  • @HeikoWiebe
    @HeikoWiebe 2 года назад

    Thanks for the stories behind the physics. Especially for this episode, as I sometimes refer to Hertz as my "neighbor", as I lived in the house right next to his home in Bonn for five years.

  • @joxford1951
    @joxford1951 6 месяцев назад

    Very interesting , thanks so much for your work.

  • @bobbrown7511
    @bobbrown7511 2 года назад

    Goodness, I love your show! Thank you!

  • @milantrcka121
    @milantrcka121 3 года назад

    Did not know about Hertz's standing wave experiment. Thank you for the enlightenment!

  • @wim0104
    @wim0104 2 года назад

    your work here is just amazing!

  • @skateywatey
    @skateywatey 2 года назад

    This is so interesting! :) thank you Kathy! I just found your channel

  • @martinmalloy8119
    @martinmalloy8119 3 года назад

    thank you for another fantastic video Vielen Dank from Germany

  • @dosomething3
    @dosomething3 2 года назад

    6:18 in order to create standing waves. He first had to move the mirror until he was getting a stable measurement. Only then, could he move and see that the amplitude is rising and falling per motion.

  • @fberron
    @fberron 5 лет назад +3

    Great way to learn science! Thank you!

  • @marcopilati7464
    @marcopilati7464 2 года назад

    I'm impressed.
    I'm a fellow-citizen of Guglielmo Marconi, fanatic admirer of him.
    I'ts very impressive to hear here that if Hertz had lived more years, he probabily would have invented radio-telegrapy!
    Impressive indeed!

  • @TreyMo69
    @TreyMo69 2 года назад

    This is a truly fantastic video - thank you!

  • @bobblacka918
    @bobblacka918 3 года назад +2

    I just discovered your channel and I love it. I've been involved with radio since I was five and that was 65 years ago. I eventually became an electrical engineer but am still fascinated by the early pioneers of radio. You videos are well researched, accurate, and interesting. One point to note is that Hertz would have not discovered radio waves had not the battery been first invented. And the battery also depended on previous discoveries and inventions. I think it would be interesting to trace back as far as possible how previous inventions provided the impetus for subsequent major discoveries. If you have already done this, my apologies. I'm new to you channel and have not yet seen all the videos, but I'm working on it.

    • @Kathy_Loves_Physics
      @Kathy_Loves_Physics  3 года назад +4

      I think you will be pleasantly surprised when you look at my other videos.

  • @Guillermo3346
    @Guillermo3346 3 года назад

    Fantastic!! You are Great!

  • @climbeverest
    @climbeverest 3 года назад

    I wish we could hear your lectures live

  • @bejo5161
    @bejo5161 2 года назад

    Good work Kathy, Physics=FUN!

  • @hank1519
    @hank1519 6 лет назад +1

    Another great walk through the history of science

  • @sikhswim
    @sikhswim 2 года назад

    This is the best telling of history EVER

  • @ReevansElectro
    @ReevansElectro 3 года назад

    What is a vinyl record? What kind of contraption is that shown at 3:08? Is that similar to those ancient "Compact Discs"?

  • @Ian-lx1iz
    @Ian-lx1iz 3 года назад +1

    Ha-ha-ha - I love it!
    (1:59) I just BET he did! Only glad that it caused a spark rather than his fiancée yelling for a Gendarme.
    lol

  • @markspc1
    @markspc1 3 года назад

    Great video. Thanks the history.

  • @ciceroaraujo2552
    @ciceroaraujo2552 3 года назад

    Fascinating

  • @rexmoneymaker7853
    @rexmoneymaker7853 Год назад

    Superb! I'm a mere biochemist, though had to wade through spectroscopy. Sometimes I wonder how I made it!

  • @Kidderman2210
    @Kidderman2210 2 года назад +1

    Radio waves were discovered in 1879 (9 years before Hertz) by the Welsh-US inventor David Edward Hughes. It was demonstrated to the Royal Society in London in 1880.

    • @Kathy_Loves_Physics
      @Kathy_Loves_Physics  2 года назад

      True, but he was convinced that he was just seeing induction.

  • @MaestroKinoc
    @MaestroKinoc 2 года назад

    Really interesting and clear information. Sad that Herz died so young, life's like, we must enjoy consciousness and live the best we can every day. Will share this with my classmates here in Mexico. I think there´s still a lot to discover in science that can make this a better world. Hope you´re really fine.

  • @chgian77
    @chgian77 Год назад

    Brilliant! thanks for these amazing historical facts. I have read that not all of Hertz's conclusions were correct, some of his conclusions were wrong because he didn't take into account the room's dimensions. Unfortunately, I didn't manage to find more details. Could you please make some research about it?

  • @edwardorlowski4184
    @edwardorlowski4184 11 месяцев назад +1

    What's the frequency Kenneth?

  • @marcomanzaneda5488
    @marcomanzaneda5488 Год назад

    excelent video, congratulations, I hava a question, excuse me, why did he use two metal spheres to the end? what was the function of thes spheres and why now some people don´t use that spheres and use plates? please ty

    • @Kathy_Loves_Physics
      @Kathy_Loves_Physics  Год назад

      It didn't do anything, he just tried whatever hoping that something would work.

  • @LucasPinheiroV8
    @LucasPinheiroV8 3 года назад

    Very good class!

  • @gerrymcerlean8432
    @gerrymcerlean8432 3 года назад +2

    Thank you so much for your fascinating videos.
    Perhaps I have missed it, but you don't seem to have mentioned Bardeen, Shockley and Brattain who won the 1956 Physics Nobel Prize for what I consider the greatest invention of the 20th century - the transistor.

  • @gerrymcerlean8432
    @gerrymcerlean8432 3 года назад +1

    Best line: "He was showing his equipment to his new fiancee".

  • @gowrisankar3978
    @gowrisankar3978 5 лет назад +1

    Superb explanation mam....

  • @hanyelbanna3673
    @hanyelbanna3673 2 года назад

    Wonderful
    Thanks
    Go on

  • @redknight344
    @redknight344 3 года назад +1

    Can you do a video about Heaviside please??? he is a forgotten genius that make a lot of contributions to modern EM theory.

  • @mnada72
    @mnada72 2 года назад

    Thank you 🙂

  • @PacoOtis
    @PacoOtis 3 года назад

    Greetings! 5:51 Parallel or perpendicular? (great video)

  • @ryansmith5436
    @ryansmith5436 Год назад

    yes kathy!! i feel you 😅

  • @kimsahl8555
    @kimsahl8555 2 года назад

    The electromagnetic waves is what to tell us about rest and motion - both relative and absolute rest/motion go away in Hertz experiment.

  • @Luachair
    @Luachair 5 лет назад +1

    William Thomson's name is misspelled......I love the vid especially the way the Maxwell Equations are cunningly navigated

    • @Kathy_Loves_Physics
      @Kathy_Loves_Physics  5 лет назад +2

      Thank you for pointing that out, I always want to add a "p" to Thomson's name, don't know why. I have to figure out how to add a little card over the video without redoing the whole video.
      Glad you liked the video aside from my spelling.

  • @dougdoug2165
    @dougdoug2165 2 года назад

    What form do the magnetic and electric fields take with dc current? Thank you for your help!

    • @goodmaro
      @goodmaro 2 года назад +1

      With a DC current there is no electric field, not even an induced one. You have to stop the charges with an excess in one place or another to produce a fixed field, or oscillate them (or otherwise accelerate, i.e. change, their motion) to induce fields. However, a DC current *does* produce a fixed magnetic field, as has been illustrated in earlier entries of this video series.

    • @dougdoug2165
      @dougdoug2165 2 года назад

      @@goodmaro if thats the case why does my clamp around dc ampmeter measure current without touching the wire?

    • @goodmaro
      @goodmaro 2 года назад

      @@dougdoug2165 Let me get this straight...you have an ammeter that has a probe you clamp "around" a wire, and the other ammeter lead is what, grounded?

    • @dougdoug2165
      @dougdoug2165 2 года назад

      @@goodmaro no it looks like a lobster claw just like an ac clamp around meter. You simply open the claw and it has interlocking metal laminations inside that connect when closed. No other connection made it reads the amount of dc current flowing in amps.

    • @goodmaro
      @goodmaro 2 года назад

      @@dougdoug2165 Wikipedia under "current clamp" describes a few types of ammeter like that. There is no electric field around the DC conductor, but the clamp is able to measure the *magnetic* field from the DC, and from that the current can be calculated.

  • @rolandmousaa3110
    @rolandmousaa3110 2 года назад

    Sincere thanks for the history and understanding physics.. (inventor)

  • @schoolssection
    @schoolssection 2 года назад

    William Thompson was elevated to the peerage as "Lord Kelvin".

  • @saghir4625
    @saghir4625 6 лет назад +1

    Great video

  • @surendrakverma555
    @surendrakverma555 3 года назад

    Very good 🙏🙏🙏🙏🙏🙏

  • @kourosh234
    @kourosh234 3 года назад

    very interesting. thank you

  • @dududuarte1000
    @dududuarte1000 2 года назад

    Wonderfull!!

  • @Simonjose7258
    @Simonjose7258 3 года назад +1

    How much of a Radio wave is a Photon?

  • @michaelmoorrees3585
    @michaelmoorrees3585 2 года назад

    Maxwell, though known as a theoretician, as performed some amazing experiments. Had Maxwell lived longer, and not die in his 50s, he may have had the 1st experiments demonstrating radio.
    As for Hertz, it was still "cycles per second" until the 1960s, when the "hertz" was adopted.

    • @parthasur6018
      @parthasur6018 2 года назад

      I think that if Maxwell had lived longer he would have discovered Special Relativity.

  • @goodmaro
    @goodmaro 2 года назад +1

    Hertz, had he not gotten sick, might have RE-invented wireless telegraphy, but could not have been THE inventor, since Mahlon Loomis had already demonstrated it decades earlier, without ANY knowledge of Hertzian waves. It turns out not to require an AC (let alone r.f.) source feeding the spark gap, because DC power (as supplied by kite and ground, Franklin style) creates r.f. transients when a long wire is switched into and out of contact with such a source.

  • @nicolasuribestanko
    @nicolasuribestanko 3 года назад +1

    I like this lady..... pleasant, enthusiastic, authentic, wholesome... fresh out of the shower!!!

  • @juliocesarpereira4325
    @juliocesarpereira4325 3 года назад +1

    "If I have seen further, it is by standing upon the shoulders of giants" Sir Isaac Newton, February 1765. Thanks Kathy.

  • @myflutewillgoon7747
    @myflutewillgoon7747 3 года назад

    great video

  • @quinto3969
    @quinto3969 3 года назад

    What exactly did Heaviside leave behind in compressing Maxwell's equations? And how is it not relevant?? Anybody know?

  • @jondeere5638
    @jondeere5638 2 месяца назад

    In 1892 Tesla designed a radio, In1898 Nikola Tesla demonstrated wireless control technology for devices for the first time. He controlled a toy boat using only radio waves, Tesla was able to control the on-off condition of the propeller and angle of the rudder, thus gaining complete steering control of his boat.

  • @ronniedrozario8883
    @ronniedrozario8883 11 месяцев назад +1

    Metro Polis, sister: gentle Tesla, a student of Vivekananda, invented 'Remote Induction', not Radio, so did not apply for a Nobel. Germany's Hertz discovered 'precise' Transist-or (radio-waves is not radio) / for music, news, sports commentary,...at a young age, died? His children-like students published his researched work in one volume, and distributed globally. Xaverian and Bangaal, Jagadish Ch. Bose came accross a copy of the text...found a tail / wire hanging from it. Now, by using his own head Bose-da invented 'a general' Radio / wireless telegraphic device, that which fitted to Hertz's transistor, Graham Bell's wired telephone became wireless each, with the former, Radio-Transistor. The 1895 Kolkata, India Bose-da's demo. at Britons' Town Hall 'predates' others. Marconi's patent - 1901. And now, posthumously Hertz / precise + Bose / general should be given 'a Nobel' each. Kolkata, India, & SHARE globally.😢

  • @ivornelsson2238
    @ivornelsson2238 2 года назад

    About Hertz it just shows that falling in love broaden ones mind :-)

  • @alliffmuhamad
    @alliffmuhamad 6 месяцев назад

    Cool!

  • @adhit528
    @adhit528 4 года назад +1

    how did he calculate the frequency?

    • @Kathy_Loves_Physics
      @Kathy_Loves_Physics  4 года назад +3

      He used an equation that depended on the inductance of the coil and the capacitance of the Leyden jar.

    • @adhit528
      @adhit528 4 года назад

      Thanks

  • @hyzercreek
    @hyzercreek 3 года назад

    The record you showed was not made of vinyl. It was an old 78 which were made of shellac

  • @adhit528
    @adhit528 4 года назад +2

    your videos are fantastic but some of the words really hard to catch, it could be helpful if subtitle enabled

    • @Kathy_Loves_Physics
      @Kathy_Loves_Physics  4 года назад

      I am working on it. My last 15 videos have captions and every new video I pay to caption 2-3 old ones. Hopefully, I will get to this one soon, sorry

    • @accessiblenow
      @accessiblenow 3 года назад

      You can personally turn on auto captioning, which I do, being somewhat hearing impaired.

  • @NoahSpurrier
    @NoahSpurrier 3 года назад

    Might be interesting to cover Jagadis Chandra Bose’s experiments with microwaves in 1895.

  • @Nobilangelo
    @Nobilangelo 2 года назад

    With Maxwell love Hertz.

  • @philiphorner31
    @philiphorner31 2 года назад +1

    He was showing his equipment....
    Alrighty then.

  • @ksdnsdkumar1375
    @ksdnsdkumar1375 13 дней назад

    skip to 3:33

  • @climbeverest
    @climbeverest 3 года назад +1

    Madam it will be nice to have your bio somewhere, number if children, the college you went to, your degree, how you are so knowledgeable in so many facets of physics and other subjects

    • @Kathy_Loves_Physics
      @Kathy_Loves_Physics  3 года назад +2

      I put a biography on my Patreon page (it’s free to read you don’t need to join)