Photoelectric Effect History: A Battle of Einstein vs. Lenard

[@jackd.ripper7613]

I know you're going to say otherwise, but as always, I consider this WAY too short! I look forward to these so much. Bravo!

[@Kathy_Loves_Physics]

You made me laugh. 18 minutes is too short?? Thanks.

[@climbeverest]

@@Kathy_Loves_Physics love physics history, it will be an incredible honor to see if you are lecturing anywhere

[@james-faulkner]

@@Kathy_Loves_Physics More like fifteen minutes, the rest is spent on introduction for this video and set-up for the next video and theme music on both ends. They are short when normal programming for a short show is 30 min or about 25 min runtime. Really though, why are they too short? It seems you are just getting started and it ends. Not by the information provided but because you make it so compelling.

[@robertakerman3570]

@@Kathy_Loves_Physics My attn. span says UR perfect. Nice job!

[@TomTom-rh5gk]

You are wrong she gives great logical presentations. You are looking for miindless filler. It's people like you who corrupt youtubes and turn them into click bate.

[@IckMotU]

People like you are the reason why i love youtube - despite all it's shortcommings. Thank you very much!

[@secularisrael]

You do the history of science great service, bringing to light these amazing stories with scientific accuracy, passion, and great storytelling. I could have written this on any of your videos, really, they're all so wonderful! Thank you.

[@Kathy_Loves_Physics]

Thank you for that lovely comment. Cheers, Kathy

[@jaimeduncan6167]

@@Kathy_Loves_Physics please do one on Maxwell he is so underrated

[@RadicalCaveman]

@@jaimeduncan6167 MAXWELL is underrated? He's widely regarded as a giant.

[@mskellyrlv]

Einstein later commented that general relativity, which treats space-time as ... well, a substance, since it can be bent in the presence of mass, is basically the equivalent of an aether. In fact, he didn't see how anyone could conceive of cause and effect without the existence of an aether. Great video, though. Immensely enjoyable and informative.

[@shirish11]

Ma’am, I am hooked to your channel. You give out exactly what I need - the story behind the discoveries . I teach physics. The children love these stories and become more receptive to the concept being taught. Thank you from a teacher in India.

[@mcchuggernaut9378]

I just found your videos, and I have to applaud you! REAL, HISTORICAL RESEARCH! I love it! I subscribed after just two videos. Your content is intelligent, informative, based on actual first-hand accounts and publications, doesn't use third-hand cursory "conventional layman knowledge", and I have learned a lot, as a student of history! Ten out of ten, I love it! Also, don't worry about people saying these are "too short", rather, they are concise and give you exactly what you need to know without filler or long and annoying adds. You are doing the world a service!

[@Memfys]

I came across your channel only recently but it has since become my favourite. Cheers!

[@ahmedrafea8542]

This is far more interesting and informative than anything I could hope for in a piece about history of science, particularly physics. I love the way you dig into personal, social and historical details to bring up the physics. The presentations are so accurate, entertaining and motivating. I have red so many popular science books, but these videos take the issues into a different realm. Thank you so much. Well done, and please keep up this impressive work.

[@Kathy_Loves_Physics]

Thank you so much.

[@erichodge567]

Hi, Kathy. I have just begun to watch your channel, and I cannot begin to tell you how much I'm enjoying it, although I guess I just did. In any case, your mixture of story and science really hits the sweet spot in the vast spectrum of physics videos on KZbin. This is great work, so thank you again.

[@gustavderkits8433]

Thank you for putting this information in one place. I was aware of it, but your presentation gave an excellent summary in a single well-organized place. When my grandchildren are old enough to ask about it, I will use your presentation as part of their education. Incidentally, one recent history of World War II had a quote that, the reason the allies won the war was because “our German scientists were better than their German scientists”. There was a book called, “Hitler’s Gift” by Pike and Medawar on the benefits to the Allies of accepting the Jewish scientists the Germans expelled. When Erik Kandel got the Nobel Prize I remarked to my children that the gift continued into the next generation. In the end, the discrimination did not pay.

[@bobdinitto]

Your videos on the history of physics have really piqued my interest in the scientific intrigues and dramas that played out both in public and behind the scenes during these turbulent times of the 20th century. I'm avidly ingesting your extensive catalog. Thank you!

[@karlschmied6218]

I love your videos which, as far as I know, are unique on youtube.

[@dosomething3]

5:48 “ then Leonards… had little to do with roentgen “ so Leonard thought that he discovered that cathode rays can travel in the air. But really, it was not the cathode rays traveling in the air. Rather it was the x-rays. But Leonard still produced these x-rays unknowingly. That’s worth something. Without Leonards work, roentgen would not have made his discovery.

[@johnrendle1303]

Kathy, you are superb!!!!! So much work and research must go into each of your amazing videos. You present them so naturally and clearly, it’s like having a chat with a friend with a brilliant and learned mind! Wow!

[@DaxVJacobson]

History is nuts, and you tell it so well over and over, so many things I've heard before but without so many interesting details. Thank you!

[@erikziak1249]

I really love how you tie together science facts with the people who discovered them, with the general era, how wars, ideology and superstition (prejudice) influenced so many things. I can binge watch your videos for hours, never get tired or bored, even though I mostly know the "science". Or maybe it is because my background knowledge, I am able to binge watch without problems. Hard to tell. Regardless, great videos, Kathy!

[@jacksondouglas5694]

I studied physics and one of my oldest professors was a German physicist who studied at Heidelberg University in the 30´s with incredible professors. Sommerfeld, Heisenberg, etc. On one occasion he told me that he had an experimental class on X-ray diffraction and the professor who was a fascist prepared a crystal in such a way that the diffraction pattern was a swastika. Probably was Lenard.

[@monroeclewis1973]

Your love of science is contagious!

[@robertschlesinger1342]

Excellent video. Very interesting, informative and worthwhile video.

[@NNiSYS]

It is so much easier to remember facts, new words & concepts when they are tied to the people Who struggled to understand them & that is the service you are doing us all dear Kathy. Thank you for BEING YOU. I really appreciate you and your work!

[@jenko701]

Oliver Heavyside would be a great topic of one of your videos. He gave us Maxwells equation in the form we are familiar with.

[@jk7690]

I learn and get entertained, what else could one want from a youtube channel!

[@Kathy_Loves_Physics]

Thank you! That was so sweet. I wasn't sure this one was particularly entertaining.

[@Go_for_it652]

Your the best story teller on the net ! Your No 1

[@jensphiliphohmann1876]

I love you, Kathy. Your insight into the history of physics is pretty detailed and simply great.

[@Kathy_Loves_Physics]

Aww thanks

[@cosmicHalArizona]

So clear & a groundbreaking discovery.

[@richardpetervonrahden6393]

Had never heard of Lenard before, but fascinating to hear of both the good and malevolent influences he had on science and the course of history. Thank you.

[@patrickwalsh2361]

I’m binge watching your videos Kathy! Hands down the most insightful and informative accounts of the history of physics! I’m going to order your book too - I’m sure it’s great also. Thanks much!

[@carrickrichards2457]

What great depth and understanding the minds involved, so well laid out. Thank you

[@CrashChemistryAcademy]

Love your channel. Thanks so much for these videos.

[@toymaker3474]

u failed to mention the part where einstein concluded in a letter to lorentz that the aether must exist.

[@lewiswithrow1936]

Kathy's enthralling narratives bring to life the thinking behind the great discoveries that have given us the modern world. Free on my laptop. I am grateful.

[@cajun70122]

Thanks! Really enjoying your videos!

[@saketpthak70]

Great video as always and what a great presentation.

[@Kathy_Loves_Physics]

Thanks

[@OrlandoRodriguezHK]

Excellent video, it really helps to learn about the human side of scientific progress.

[@chrisspinolo6983]

Your videos are sooo fascinating!!! Love how you relate the Story behind the science

[@ruanlslima]

geez, that's fantastic content! I could spend hours listening to you telling me all about it! "You've got a 'subscriber' in me"

[@Kathy_Loves_Physics]

So glad you liked it. I have a ton of videos so you can actually spend hours listening to me if you want.

[@nassehk]

I am discovering your channel too late! These are great videos.

[@Kathy_Loves_Physics]

It’s not too late. I’m still here.

[@nassehk]

@@Kathy_Loves_Physics Awesome. Please keep on making. How do know so much about the history of science? It is just amazing how much ground you cover in each video.

[@Kathy_Loves_Physics]

Thanks I find history of science and scientists to be a puzzle and I love putting the puzzle pieces together

[@iainhunneybell]

Brilliant Kathy. Informative and entertaining. Thank you so much. Fascinating

[@btecappliedsciencehelp]

great video. The context behind some of the stuff I teach is fascinating and you explain it so well.

[@julian65886]

Wow, great video. There are not many like you in the world! Awesome!

[@JoshKaufmanstuff]

@11:15 the "Ether" I've wondered this same thing, if light is a wave, why does it not need a medium to propagate as fluids do? What am I missing?? 🤔

[@pozzowon]

The history of conflicts between scientists is extraordinary! Gives you a completely different perspective of being an observer in today's world

[@biopsiesbeanieboos55]

New subscriber. You occupy a very niche corner of the scientific education fraternity. You obviously have a passion, and these are important stories to tell. It reminds us that the things we take for granted today, only came about as the result of patience, persistence and a bit of pestering before new theories got taken seriously. A great lesson for young scientists in all fields.

[@otiebrown9999]

What a great history! Thanks!

[@nathanwestfall6950]

Great content and delivery!

[@zendoc49]

historical perspective of science well done, Kudos

[@NondescriptMammal]

Your concise but detailed historical perspective has helped me, as an interested lay person, better understand the physics itself, while making it interesting and bringing it to life from the historic side. Thank you!

[@Kathy_Loves_Physics]

Glad it was helpful!

[@ralphdavis9670]

Yes you do have a lot of other videos; I am inundated with them, but enjoying it. Thanks Kathy.

[@henrytay1706]

Kathy is marvelous! She presents it interestingly!

[@onlinelearningguide]

Hello Kathy. I want some of the papers of A. Einstein to read them thoroughly. Would you mind if you help me out, please? What can you help me?

[@supermikeb]

All the scripts with citations are on her web page.

[@thegloriousryius]

You are great story teller. I will have to watch these videos again, so that I can learn everything explained.

[@Kathy_Loves_Physics]

Cynics Truhseekr glad you liked it.

[@JaiAryavart108]

I chanced upon this series on physics only yesterday which delighted me much. Though I have been student of Indian and Western philosophy, I loved to know something about physical world, where physics came to my help. I am cypher in maths I still could understand theories and their applications. Your presentations are very helpful in knowing history of physics in lucid way. Thanks.

[@RobertJohnson-zs4om]

I always enjoy your lectures on the people who are behind the equations. that is part of the story. thank you

[@elonstaxang350]

Great summary, presented very entertainingly, thanks! Just read about the rise and fall off Lenard in a memoir book. Sad to ruin a career by going head first into fascism and personal vendettas.

[@Kathy_Loves_Physics]

Elon Staxäng oh man, Lenard was a hard one for me. He could be charming and helpful and his Physics started off being top notch. In addition, I felt for the guy being at the step right before a major development time after time. And then reading how he fell into madness and fascism was painful. Bleh. Glad this video is over. Ps. What book did you read?

[@zes3813]

no such thing as vend or etc

[@david203]

@@zes3813 huh?

[@ernestoyepez5103]

I just find this channel its SOO good

[@keybawd4023]

Another superb video bringing it all to life as you bring the scientists to life. One scientist that I was sad you didn't mention -- you referred to him as a British scientist - is Arthur Eddington. A fascinating and important man. A torch bearer for Einstein (as well as an eclipse watcher for Einstein!). He was no mean scientist either, especially in cosmology. He proposed that the energy of the stars came from fusion, and he was proved right. I wish there was an index of your videos, I can't always find one that follows another. The Lennard story is amazing and I shall have to watch the video again - pure drama. I am learning so much. Thank you.

[@Kathy_Loves_Physics]

What little I know of Eddington is very interesting and I’m scared to look into it more deeply cause I’m gonna fall down that rabbit hole I just know it.

[@keybawd4023]

@@Kathy_Loves_Physics I can't imagine you falling down a rabbit hole - but if you did I'm sure you would make an interesting video about it! But how about a video on the journeys to Principe and Sobral (in Brazil) for the eclipse, and the problems - in Sobral the villagers wanted to set off fireworks during the eclipse and that had to be diplomatically stopped. Then (I think) Eddington was very "generous" in his interpretations of the photos. A fascinating story.

[@neomonk5668]

Thank you for another wonderful video. It sounds like the “ether” idea would fit into QFT. Peace

[@factfiend1000]

Quantum ether.I've read of the idea. Zero point energy could be the culprit.

[@pauljmyers1]

Fascinating. thank you!

[@meteor09]

Your videos are exciting and informative!

[@Kathy_Loves_Physics]

Thank you!

[@FilterYT]

Thank you Kathy, nice job!

[@richtraube2241]

Only two minutes in and am already extremely fascinated.

[@ronaldbailey8310]

Just discovered your channel. Love it so. You are my Guru

[@felipemonteiro5877]

Excelent material! I'm absolutely hooked!

[@Kathy_Loves_Physics]

Thanks

[@AndySpicer]

That was really good! I’m happy to have found your channel.

[@Jiggerj01830]

Finally, someone in the field of science that I can almost understand. 🙂

[@Gr8nity]

This is so good I had to log and like with all my accounts!

[@Kathy_Loves_Physics]

That is so nice!! Thank you.

[@KingAeetes]

Excellent presentation! I learned a lot.

[@Kathy_Loves_Physics]

So glad you liked it. This video was one of my most challenging.

[@mariosilva000]

It is so great! Thanks!

[@crawford323]

If you can, increase the distance between you and your illumination from your ring light. Some of your image is nearing saturation. Only 30 cm or so should be enough.

[@daveedscottkorup]

Brilliant!!!

Amazing video!

[@gergopokol7678]

Love your storytelling...

[@blanstevslc]

Late to the party, but ... you really hit this one out of the park, Ms. K. Thanks!

[@Kathy_Loves_Physics]

It’s never too late to give me a compliment, thank you 😊

[@sovereignruler]

My father idolized Albert Einstein; the manner in which you speak about him brought back some incredible memories of my dad. Thank you Kathy.

[@Kathy_Loves_Physics]

That is lovely

[@pukulu]

very interesting bit of physics history. This demonstrates that a scientist, even an accomplished one such as Lenard, can still harbor a personality disorder of such magnitude that he becomes twisted into a grotesque figure.

[@batarasiagian9635]

Informative yet entertaining. Well done.

[@johndavis5835]

Thanks Kathy

[@pboni76]

This is spot on! 👋

[@nicholasivanderstoop4191]

Brilliant simple historic perspective on science and the inherent prejudice of scientists. Nobel not so Nobel. Thank you.

[@dyrthos2955]

Great job, had never heard of Lenard or drama with Nobel committee not awarding the medal to Einstein because of Lenard's efforts

[@spencerpanes8748]

Wonderful video ❤️ this deserves more views and likes.

[@ardecki7961]

Good job, as usual.

[@Kathy_Loves_Physics]

Thanks, as usual ;)

[@billlemus3567]

thank you your contribution

[@Kathy_Loves_Physics]

you are welcome

[@anneanne6077]

Wow you're amazing 😍🤩 I'm glad I discovered your channel

[@disenoeingenieriaaxial3753]

I loved your video! Why you don't post a video about Francois van Rysselberghe? He's the father of long distance telephony and my great grandfather too!

[@nicktripp3689]

Great and so we'll presented.

[@kws1957]

Thank you !

[@bullhaddha]

I studied physics in Heidelberg, when the "Physikalisches Institut" was still in the building they built just for Lenard. One or two of the professors that taught there pointed us to the history that lay behind the walls.

[@SumitYadav-mx8bp]

This is the one the most informative and interesting video I have ever seen :)

[@Kathy_Loves_Physics]

Thanks

[@agenolmedina9159]

Awesome story!!! Thanks!!! I loved it :)

[@jedaiahx]

Your channel is excellent.

[@eraoflearning6908]

I just love it all It's a sad story of Lenard's life..and a lesson for all of us.

[@sumo1203]

What an awesome channel

[@JoseBarahonaes]

Marvelous story, I loved this video

[@xtrofilm]

I wonder if Lenard's Ether was right after all, Quantum Fields by another name and Electrons just folds in those Fields.

[@Jalcolm1]

She is the Beethoven of physics explainism, whatever that means. I am always astounded that Einstein understood cosmological forces while believing that the Milky Way was the entire universe. You can have only a tiny sample and still decipher the entire structure. She is doing God's work, which is more than He ever did.

[@ronitkumarmishra5904]

Your videos are like gem for us physics students. Thanks a lot.

[@Kathy_Loves_Physics]

You are quite welcome. Glad you like it

[@hg1288]

Wow, didn't know photoelectric effect has such long and interesting story. Thanks kathy

[@sanjursan]

Kathy, you are certainly one charismatic and intelligent individual.

[@GeoffreyFeldmanMA]

Here is a fun experiment one can do with digital voltmeter. LED's work backwards, producing current from light! Take an LED, best a larger one (but not the compound ones which produce different colors). Connect it to the meter and shine a bright light on it. You will get a voltage! Using an inexpensive microprocessor (such as the arduino) write a program that sends small pulses to the LED, barely enough to light it. This builds up an electric charge in the junction, which does not discharge due to lighting. Measure this charge (with the microprocessor) depending on exposure to external light. The charge will dissipate faster with the external light. Finally, you can observe that the discharge is faster with light of a similar wavelength to what the LED produces.