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JJ Thomson Cathode Ray Tube Experiment: the Discovery of the Electron
Рет қаралды 131,509
Күн бұрынIn 1897, JJ Thomson discovered the electron in his famous cathode ray tube experiment. How did it work and why did Thomson do the experiment in the first place? Watch the video and find out!
As usual a big thank you to the fabulous Kim Nalley for her background music and her version of Schoolhouse Rock's "Electricity, Electricity" for my intro song.
@XB10001 2 жыл бұрын
5:37 ... that's not even close to 1/3 of the speed of light. Did you mean per second?
@Kathy_Loves_Physics 2 жыл бұрын
Yes I did. Slip of the tongue
@XB10001 2 жыл бұрын
@@Kathy_Loves_Physics :-) ... you can edit the video and overlap some text with the correction. That's common practice. Something like "* Per second" that's easily readable.
@Kathy_Loves_Physics 2 жыл бұрын
I actually can’t. I tried with another video and it was impossible I can only edit it and reload it in which case I lose all my views which I think is not worth it for a little slip of the tongue.
@XB10001 2 жыл бұрын
@@Kathy_Loves_Physics oh, that's a shame. Anyway, clarify in the description perhaps.
@Kathy_Loves_Physics 2 жыл бұрын
Good idea. Will do
@nhack5504 2 жыл бұрын
I'm a retired engineer and have found your videos most interesting. I've learned many bits of background I had not learned back in school. I particularly like the progression of science that your videos provide. Nicely done!
@edcooper5841 2 жыл бұрын
Kathy makes science and history come alive. I would loved to have been in her classes.
@rumlia 2 жыл бұрын
I have only one thing to say: your explanations and expressions are wonderful. Thanks for making me curious to learn when I have crossed 60 yrs of life. Cheers!
@h2energynow 2 жыл бұрын
Find the explanations great, what makes it special is you also go into why, how, and what motivated the inventors. Awesome.
@ronkirk5099 2 жыл бұрын
I knew that J.J. Thomson was a trail blazing scientist, but it was very interesting to hear that he mentored so many Nobel laureates. Science history is fascinating. Great video.
@proudsnowtiger 5 жыл бұрын
I lived and worked in Cambridge for a while, and it was always a thrill to drink in the same pubs where the discoverers of the electron, the structure of DNA and so much more sat and talked. Not to mention that Maxwell started the Cavendish, so it's holy ground indeed. But hey, lay off the humble plum pudding. It's part of every English childhood, and once you've learned to digest it it's actually quite nice.
@Kathy_Loves_Physics 5 жыл бұрын
proudsnowtiger sorry I shouldn’t insult plum pudding without trying it first!
@CliveChamberlain946 5 жыл бұрын
@@Kathy_Loves_Physics One has to wonder how many food lover comments are going to be served-up by your viewers ;)
@Kathy_Loves_Physics 5 жыл бұрын
@@CliveChamberlain946 are plum pudding fans "food lovers"?? arg, there I go making fun of plum pudding *again*. I can't seem to help it. :P
@wiregold8930 2 жыл бұрын
@@Kathy_Loves_Physics make sure you cover it with brandy sauce (syrup) first!
@GoldFoilDecendent Жыл бұрын
Great to hear the history of the discovery of the electron. My last name is Rutherford and as an electrical engineer have found myself drawn to learn more about Lord Rutherford. Enjoyed your video on the works of his Professor.
@annasdad8008 2 жыл бұрын
I just recently found your channel and really enjoy it. I remember duplicating a number of the classic experiments in a physics class back in high school (early 1970s). It was fascinating then and it still is. By the way, I did notice an error. To be going “almost a third of the speed of light” would mean the electrons were traveling 60,000 miles PER SECOND, not per hour.
@julianramirez4465 5 жыл бұрын
Kathy i love u, glad u came back. Loved the Thompson story.
@douglasstrother6584 2 ай бұрын
"Electromagnetic Fields and Waves" by Lorrain & Corson (2nd Edition) contains a problem in chapter 2 "Electrostatic Fields in a Vacuum" (2-19) on J.J. Thomson's "Plum Pudding" model of the atom. It asks to (A) find the force on an electron; (B) describe its motion; (C) the frequency for a 1 Angstrom-sized atom; and (D) compare this frequency to that of visible light. A rather thought-provoking question in an Undergraduate E&M textbook!
@jamesknapp64 Жыл бұрын
Gonna have to binge more of your stuff Cathy. As a former Math and Physics double major this feels like all the gaps of why from the books that has been stripped out.
@shawnmulberry774 4 жыл бұрын
With all due respect to JJ Thomson, I'm just glad we ultimately choose electrons over corpuscles.
@2lefThumbs 2 жыл бұрын
Corpuscle is ok, "corpsjcle" sounds like a zombie treat"
@physicsAmbler 2 жыл бұрын
And even better than “corpsucles”!
@djmips 2 жыл бұрын
Agree? But we should have adopted his current flow direction. XD
@shawnmulberry774 2 жыл бұрын
@@djmips Absoolutely, current flow is so unnecessarily confusing.
@lawrencedoliveiro9104 2 жыл бұрын
I thought Newton used the term “corpuscle”, too, only this was for the particles of light.
@njkauto2394 2 жыл бұрын
I truly couldn't stop laughing at people being tortured with plum pudding. As an antipodean (Australian), I was tortured with plum pudding every Xmas and New Years. Now, as an old man, I actually look forward to it each year. I love your sense of humour, Kathy 🤣
@chuckotto7021 5 ай бұрын
Dear Cathy, You are so wonderful! You possess the vitality and focus to bring dusty sheafs of scientific tracts to LIFE!
@joeolejar 2 жыл бұрын
I'm hooked! Yours may be the history channel for electrical nerds.
@videolabguy 2 жыл бұрын
Loved this one, Kathy. Of course I did. My career is constructed on the cathode ray tube and all its derivatives. In fact, I was working on one designed in 1939 today. Most recently, I successfully got pictures out of an authentic Farnsworth image dissector. I love physics and science too! Thanks for your channel. You rock.
@Kathy_Loves_Physics 2 жыл бұрын
This is funny that you mention a Farnsworth image detector because in 3 to 4 more videos I’m finally (finally) going to do my video on Philo Farnsworth. Hey, maybe we could do a bit of a collaboration. Shoot me an email at KathyLovesPhysics(AT)gmail.com if you are interested.
@patrickcleveland8148 2 жыл бұрын
Just compliments… I enjoy listening in. I have spent 50 years in the industrial world and have heard all the names, you so kindly mention. Never understood the stories behind the names. Thank you for your research and sharing with us.
@chriswalker7081 2 жыл бұрын
These are great videos. The stories behind the discoveries are so interesting and add a real human element. Your presentation style is perfect - keep it up!😁
@jgboyer 2 жыл бұрын
Your videos always make me happy! I love to hear the stories of how it happened and who did what.
@MichelangeloFPV 2 жыл бұрын
Congratulations for your great channel Kathy!!! I love how objectively you portray characters often misunderstood like the great Nikola Tesla. I really appreciate your dedication in researching and sharing all these historical curiosities !!!! This also really helps to realize that these were human beings and sometimes not so brilliant, when trying to explain their findings.....
@MrQbee87 2 жыл бұрын
Hi. I just discovered your channel... and I LOVE it. It's just so adorable when you use modern vocabulary talking abut historical figures, and the little jokes you put in here and there. I like the fact that the videos have this "amateur look", that shows dedication and geeky passion, and are not full professional and monetization oriented. I'm binge watching your videos right now. Also kudos for your pronunciation of Skłodowska's name.
@vectorsigma9903 2 жыл бұрын
These are the best videos ever. Love the history and characters in them. Thank you Kathy!
@alastairchestnutt6416 5 жыл бұрын
Love your channel. Interesting and informative. Often watch more than once to grasp all the ideas.
@Kathy_Loves_Physics 5 жыл бұрын
Hope that is a good thing and not a bad thing (watching twice).
@simonmasters3295 Жыл бұрын
I love your videos
@ganesh28787872 4 ай бұрын
No words to express the thanks to you kathy for such wonderful contribution by bringing the fascinating history of all scientific events with such a simplicity. Thanks a ton
@jackd.ripper7613 5 жыл бұрын
I can't believe I was 7 hours late to my favorite KZfaq channel. I wish your videos were an hour. The perfect blend of history and science. They leave me wanting to smoke a cigarette afterward and looking forward to more.
@Kathy_Loves_Physics 5 жыл бұрын
Jack D. Ripper and here I was worried that my videos are too long. I always try to make em shorter than 10 min and almost always fail.
@Kathy_Loves_Physics 5 жыл бұрын
Jack, I got a new video out!
@yuvrajcharan5387 Жыл бұрын
For years I have been searching for an video which actually combines pure physics with contemporary history your videos make that reality thank you very much for that. Love from India
@jeffharrison1090 Жыл бұрын
So interesting to find out that these giants in physics weren't born with a silver spoon in their mouths! Or had intuitive insight at all times. You convey their truly humble beginnings as well as their brilliant observations, their spats, their loves and their humanity (gifts and faults) that we all have! And make it all so entertaining! Thx so much!
@SteveRaynerMakes 2 жыл бұрын
I'm subscribed, and now I'm spending all day watching your videos.
@vijay_r_g 3 жыл бұрын
Its from your channel that I get many of my doubts cleared....I'm really happy. You really owe more ....
@brettselph7591 2 жыл бұрын
Kathy, even if i freeze to death (and become a corpsicle), I'm always gonna love your videos! ❤️
@Kathy_Loves_Physics 2 жыл бұрын
Aww you turned my mispronunciation into a compliment. Thank you. 😍
@brettselph7591 2 жыл бұрын
@@Kathy_Loves_Physics Oh no, now i adore you even more! This is very bad for a corpsicle, if i melt 💘
@drsjamesserra 2 ай бұрын
Most elaborate video I have seen including the history. Good work Kathy!
@timothym2241 2 жыл бұрын
Thank you for making these videos so interesting and informative.
@indianhistorybuff Жыл бұрын
Wow! Your Chanel is exactly what I was looking for! The story of the experiments, the conclusions and then contradictions which led to better and better understanding.
@nancymisage2574 4 жыл бұрын
Thank you for your videos. With public schools closed due to Coronavirus, your Channel is helping me "teach" the remaining topics to my students in a way that will hopefully spur their interest in both Physics and History.
@Kathy_Loves_Physics 4 жыл бұрын
Glad to help. If you want to talk (teacher to teacher) feel free to email me (the link is in the About me section). Good luck
@davidharvey6169 2 жыл бұрын
love it, very cool and fun to learn when you are presenting the information.
@Felix-ge4sd 6 ай бұрын
I rarely comment, but thank you so much for this! This is an interesting, well-illustrated, and very clear video to watch!! You really gave us an insight of what was going on in Thomson's mind, and this is exactly what I needed!
@danielforderer968 2 жыл бұрын
Congrats to Kathy. Your Videos are fun to whatch and listen to.
@JamesFSmith-cb9lz 2 жыл бұрын
Kathy....you're awesome! Thanks!
@SabaDhutt 4 жыл бұрын
That was amazing. Comprehensive and to the point. Lady, you deserve a million subscribers. Keep up the good work.
@Kathy_Loves_Physics 4 жыл бұрын
Thank you! 😊
@pipb1426 3 жыл бұрын
Watched all the vids on youtube on this topic for my chem prac. This one was by far the best, you explain things so well! Just amazing.
@bearcalw 2 жыл бұрын
Thank you for teaching me an old man wanting to learn about electronics you are such a good teacher
@iaov Жыл бұрын
Love your videos Kathy! Thanks little sister. You rock!!
@MrDsalomon 2 жыл бұрын
In a word, important and elegant (both the video and JJ's work).
@enthros5116 2 жыл бұрын
I love Kathy and physics too. Now I grasp Physics a little more, thanks 4 the awesome videos. You Kathy are Marvelous
@Kathy_Loves_Physics 2 жыл бұрын
Thank you 😊
@amramjose 5 ай бұрын
Haliday and Resnick was some 40 years ago for me, thus your videos are a great refresher of the electricity portions of the course. Cheers.
@jamesdriscoll_tmp1515 2 жыл бұрын
Very well done. It would be cool to get the history of the mass spectrometer like this.
@digguscience Ай бұрын
A very impressive view of the thompson experiment
@joeolejar Жыл бұрын
I really enjoy watching your videos a second time when it pops up in my KZfaq feed .
@rand49er 2 жыл бұрын
I've now watched maybe eight or nine of your videos, and I've enjoyed each and every one of them. They are a mix of history and scientific explanation. I just love it!
@stanallen1072 2 жыл бұрын
Loved the history. Thanks Kathy.!
@bradleybobbs 2 жыл бұрын
It's funny how, at 1:50, CTR Wilson is misspelled as "CRT Wilson", which made me wonder whether his dedication to the Cathode Ray Tube was so great that he named himself after it!
@Kathy_Loves_Physics 2 жыл бұрын
Ha! Maybe I was unconsciously honoring him.
@johnpyott4014 5 жыл бұрын
Thanks! That was terrific!
@Kathy_Loves_Physics 5 жыл бұрын
So glad you liked it :)
@ricardopiasentin5193 Жыл бұрын
I do love your classes. Thank you very much.
@bzigelnik 2 жыл бұрын
I cannot find the right superlatives for your videos. I’m going to watch every one of them.
@CliveChamberlain946 5 жыл бұрын
Dang! Have a heart, I'm on a diet.. Great video, but after those cookie and pudding references, I had to go to the kitchen for something sweet :( FWIW, I just can't figure-out why this channel doesn't already have 50,000+ subs.. and you work hard at making things look so easy!
@Kathy_Loves_Physics 5 жыл бұрын
Ha! Blame Thomson not me. :P I think maybe I don't have a lot of subs because I don't advertise it enough, or I don't have enough cats! One or the other.
@CliveChamberlain946 5 жыл бұрын
@@Kathy_Loves_Physics I recall listing your channel on EEVblog a while back.. Maybe if your name started with C people overdosing on electronics vid's would have seen more of your productions? ;) Any way, keep'er goin' gal, you've got spunk! PS: And make sure the new guy currently maintaining the list doesn't de-list you! www.eevblog.com/forum/other-blog-specific/a/ PPS: Dave Jones (head of EEVblog) is NOT cat friendly.. Ha! you should make user ID like Katy-Physics and post cat photos in one of the dog threads.. eg: www.eevblog.com/forum/chat/the-dog-thread/ and don't forget to set your Profile so your website URL matches your YT channel. You never know, a few posts in various thread at EEVblog can not only answer tough physics and electronics questions, it can also draw eye-balls to a cute physics-chic in a Topsy-turvy male dominated profession (EEVblog has almost one-billion posts.. so it's not trivial).
@julianramirez4465 5 жыл бұрын
She is goin to get there friend, i am advertising her channel right here from Colombia. International Katy lover over here.
@Kathy_Loves_Physics 5 жыл бұрын
@@CliveChamberlain946 Darn it, I should have been named Aardrina and then I would really get some good clicks! Thanks for listing me. I will check out EEVblog, seems interesting.
@Kathy_Loves_Physics 5 жыл бұрын
Aww thanks @@julianramirez4465, it is so great that I am reaching all over the world.
@trailkeeper 5 жыл бұрын
Thanks. As you have mentioned, the direction of flow was found to be wrong, basically because they didn't know of the electron yet, but at least they knew something was transporting the energy. However, it seems good to keep the error because mathematically, something raised to a higher potential, gain in energy or ability, seems to require a mathematical positive sign so as to help with the math expressions of what is going on...well at least for standard or basic electronic.
@jeffmills4103 5 ай бұрын
Thank you for posting and sharing!
@CharlesCarlsonC3 5 жыл бұрын
A fun video! Just a little bit to share that tangential related. Frank Oppenheimer had funny story about JJ Thomson. When Frank was at the Cavendish Laboratory in the 1930's. He one day found himself wandering the Cambridge Street Market, and he saw the most amazingly big cabbage in a vegetable stall. He was so amazed to turned to the stall proprietor, and said "How much is that?" The Proprietor said he didn't know. The proprietor turned out to be JJ Thomson Frank's great embarrassment. He actually blushed when he told the story, but also laughed.
@Kathy_Loves_Physics 5 жыл бұрын
Charles Carlson I didn’t include him but of course Oppenheimer was also JJ Thomson’s student (but he didn’t win a Nobel prize).
@willyjensen8595 Жыл бұрын
Wonderful history lesson about the electron, thanks
@factchecker9358 2 жыл бұрын
Another good one. It's great to see the chain of students coming from these labs to help fill out the connections.
@saksham9112 2 жыл бұрын
I felt an element of authenticity from your communication. Well explained dear.
@TheRev0 2 жыл бұрын
This video, and these videos in general, reignite my interest in studying electrical engineering
@th1ngo 2 жыл бұрын
Bzzzt. Plum pudding (along with hard sauce and fruit cake) is one of the reasons for life! Greetings from a Natural Philosopher in the Antipodes. Love your channel.
@SimonSozzi7258 2 жыл бұрын
I really could spend all day watching your videos.
@fairnut6418 2 жыл бұрын
9:18 love the quick review on the “dessert”
@1945jlee 2 жыл бұрын
Wow, just totally amazing...! Love it...
@predragpejovic611 Жыл бұрын
Simply, GREAT!!!
@edahiangure 4 жыл бұрын
Great videos, I learn a lot. The Issue of J.J. Thomson is because I have been watching some videos of Eric Dollar. He says that our modern view of electricity and magnetism may have some flaws. Much reference has been made for Thomson's interpretation of Maxwell's theory, which is now lost. I suspect there is some important physics buried in his interpretation, which leads him to think about the nature of the atoms. His conception was that Faraday tubes were something real, taking the place of molecules by analogy with mechanics. Congratulations on your videos.
@dansmalley5415 2 жыл бұрын
good, clear, and motivating history. Very good presentations. Thanks Greatly appreciated
@Kathy_Loves_Physics 2 жыл бұрын
Glad you liked it
@yousufnazir8141 2 жыл бұрын
Very essential and helpful lecture for the students of physical sciences
@MegaPraveenk 2 жыл бұрын
Blend of history & science behind .....just great
@parulraizadaschannel-sl8bj 7 ай бұрын
Very well made videos! Superb content and great presentation!
@mikemidulster 2 жыл бұрын
'An English pudding which they used to torture people with'. Hilarious! I'm glad I happened upon this channel - there's always something to learn here too :)
@eggroll1up918 2 жыл бұрын
Another great video Kathy.
@calvingrondahl1011 2 жыл бұрын
Exciting and informative. Thanks Kathy.
@ekalavyain1131 4 жыл бұрын
Finally what i need is here
@Kathy_Loves_Physics 4 жыл бұрын
Glad to help
@shawnmulberry774 4 жыл бұрын
7:44 1898 apparently was the year of the mustache.
@90a2z1 5 жыл бұрын
Kathy, I have been listening to your videos for sometime now on and off and find them to be excellent and informative. I look forward to seeing more. I can’t help but be very curious about you, are you a teacher, a physicist, a historian? What state do you live in? I think all students of science especially high school students should view your videos. They bring together and organize many of the concepts I have long known about electricity. Also, can you make it easy to understand the scientific process and why it takes so long to establish new understandings. Paul
@Kathy_Loves_Physics 5 жыл бұрын
Paul, so glad you like my videos. I started as a physicist, and then became a teacher, and am now, by default if not by training, a historian. I put the story in my Patreon page as I have more room and I thought my patrons might be interested too. You can read it (for free) here: www.patreon.com/posts/23721265
@gpwgpw555 2 жыл бұрын
@@Kathy_Loves_Physics Thank You for the Biography. I Like to know more about the people who are producing the videos I watch. It helps to understand their motivation and integrity of the content of the producer. I also take the time to read the comments. About the length of your videos, my father was a preacher. he said you should stop five minutes before the people stopped lessening. Yours are perfect. I always want more.
@thehman2007 2 жыл бұрын
What a great video. “Kathy does a great job explaining physics”.
@Kathy_Loves_Physics 2 жыл бұрын
Aww thanks
@Raphael_NYC 2 жыл бұрын
Love,love,love your videos and they way you do them. Thank you. rapahel nyc
@GojoSaturo-oy3wb 2 ай бұрын
you explained this sooo well and i thank you for that because i have a test after tomorrow
@warrendargusch5873 2 жыл бұрын
Bravo! An amazing video. Filled in the blanks too!
@zack_120 Жыл бұрын
JJ Thompson makes louder sounds in my mind for his work on electrons, the most famous, active subatomic particles 😁
@amitpatil5151 4 жыл бұрын
Hello madam, You always surprise me in each and every video by telling New untold History of Discoveries of Science by telling how each and everyone did mistakes and by accidentally discovered something new. Great Job.
@Kathy_Loves_Physics 4 жыл бұрын
Thanks Amit
@christophercarmody7094 2 жыл бұрын
Great channel, love it.
@norsagon6215 Жыл бұрын
I am having so much fun watching your videos
@Kathy_Loves_Physics Жыл бұрын
I'm so glad!
@neola1712 2 ай бұрын
Your videos are fantastic! Spreading knowledge in a world of cheap fast-food entertainment is noble and worthy. Please ignore nah Sayers and negative minds. Best wish!!!
@GungaLaGunga 3 ай бұрын
What an excelent channel. Thanks!
@shrravanpatankar77 2 жыл бұрын
Amazing!!👏 I can really spend whole day watching videos on your channel..😄
@izharfatima5295 2 жыл бұрын
That question I had first time when I encountered the idea but couldn't discuss as people around me didn't have the understanding.
@blackshadowofmysoul 2 жыл бұрын
Best channel explaining about electron! Thanks
@rubusroo68 2 жыл бұрын
these videos are fantastic!
@simontyrrell8866 2 жыл бұрын
Hi Kathy, love the channel. This christmas, here in Hertfordshire, I made 2 plum puddings for friends and family (we call them Christmas puddings these days) and they were universally admired as the definition of deliciousness!
@Kathy_Loves_Physics 2 жыл бұрын
You know, I’ve never even had Christmas pudding before and I think that it was very bad of me to insult it I just like food jokes and I thought it was like fruitcake. Sorry.
@simontyrrell8866 2 жыл бұрын
@@Kathy_Loves_Physics Please, please don't apologise - I was just keeping your food joke going, the chances of my extended family all loving the deliciousness were slim indeed! Your channel is great and you come across as a really lovely person. I hope that you keep making jokes, and if they are snide jokes about English cooking then so much the better
@arnesaknussemm2427 2 жыл бұрын
Thomson received his Nobel prize for discovering that cathode rays were in fact particles called electrons whilst his son received his Nobel prize for his discovery that electrons could also be treated as waves.
@Kathy_Loves_Physics 2 жыл бұрын
The circle of life
@mr.bianco8519 2 жыл бұрын
Your a sweetheart. Keep up the good work.almost to 100k subs.good stuff
@ashutoshhiremath4578 5 ай бұрын
Awesome job
@xenocampanoli815 2 жыл бұрын
These are really good for 63 year old men to study history of science.
@ruskinyruskiny1611 2 жыл бұрын
I love plum pudding ! (A Welshman). Oh and your videos are first class.❤
@Kathy_Loves_Physics 2 жыл бұрын
I thought plum pudding was the same thing as fruitcake, so I made fun of Plum putting endlessly. Now I am told that it is totally different and Plum pudding is delicious! Oops. 🤣
@shekharbhaskar3431 2 жыл бұрын
I'm loving more and more your content as im seeing it. 👍 You explained in such a beautiful and easy manner. Please also make videos on the development of Quantam mechanics.
@Kathy_Loves_Physics 2 жыл бұрын
I’m glad you liked it. I have made some videos about the history of quantum but right now I’m making more electricity videos as I am publishing a book on the subject (I am planning a book on the history of QM but it is years away - sorry)
@shekharbhaskar3431 2 жыл бұрын
@@Kathy_Loves_Physics Its alright. Looking forward to read your book. And your videos are worth waiting
@Overtime123 2 жыл бұрын
@@Kathy_Loves_Physics when is ur book coming out?
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