Photo electric effect & failure of wave theory | Dual nature of light | Physics | Khan Academy

Let's explore what photoelectric effect is and how the wave theory of light fails to explain the experimental outcomes.
Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate here: www.khanacadem...
Created by Mahesh Shenoy

[@mouroushihazra9524]

This is the most underrated channel I swear. People are wasting money in Unacademy, physics wallah etc whereas this is the real gem. These videos are of short times too and still makes the concept crystal clear. I mean the best 😭❤

[@Waldeinsamkeit0105]

I suggest you ... Once you should learn from old videos of alakh Pandey too ... He is the best.. i am sure you will forget this too. I agreed that he is teaching well but physics wallah ( alakh Pandey) is the bestest

[@BekaarEngineer_]

Alakh Pandey's old videos have many factual inaccuracies, he actually doesn't really go deep through the concepts and is mostly out of touch with current physics. A student won't notice this, but I am a teacher and I do. He doesn't really have an understanding of higher physics(after 12th which a teacher should definitely have). And now this man from Khan academy is different, he lives and breathes physics. Go to his personal channel floathead physics and you'll see what real physics is. And this man is actually constantly learning new stuff and is up to date with current physics

[@hemachandran0908]

Not underrated, it's unpopular in India. I think it's mainly because of the language. In America it's big! I agree 💯 that it's way better than any other Indian platform. I am a fan of Sal Khan even before these companies came into existence.

[@philosophem1629]

The bad thing is, for non English Mother tongue, indian accent is very hard to understand

[@ANSHUL-fx3bx]

TOTALLY agreed

[@VG__]

2:18 Yeah "the fun stuff"🥺❤️ your voice and excitement, that enthusiasm is unmatched and you are really the most enthusiastic physics teacher I ever saw till now, making learning so much fun, loving physics like none can. Rightly said by Sir Walter Lewin" Physics works!"

[@patrick-mn6du]

I like how you teach, you make everything very clear, thanks

[@catnoir5956]

What a great explanation! It seems you really want us to know about these experiments. It must have taken a long time to find such a beautiful teaching method. Thank you so much. :)

[@AmethystQueen-b5t]

When my teacher took this topic in class I felt so sleepy and bored. I had no hang of the topic and i thought this entire chap was a snooze but you're explanation changed my attitude towards this chapter. Thank you Khan Academy!!

[@JasperOdongo-q8u]

This sis the best lecture i have had in my lifetime of photoelectric emission ,,much love from RIPOSE LECTURES

[@vivekgupta3692]

Sir bahut time lga diya upload krne me ....Thank you so much sir

[@rahuls2111]

Best video on Photoelectric Effect on the Internet ❤ Thank you so much sir 🙌🥇🥇🥇 Side note tho: I am a citizen scientist trying to disprove Light Duality. I believe in only the Wave Nature of Light.

[@prachurjyachakma2296]

Never seen someone explaining physics like you do... Thanks a lot❤️

[@snehapaul1]

Are you from tripura

[@hayah6583]

That was a wonderful explanation. Thank you!

[@SabihaAktar-f2p]

Amazing shot🤟 Loved it😍

[@salehelsayed2558]

this can be one of best videos and explanations in my life big thanks for you

[@krishangeedeka9170]

Can I just say I was blushing listening to you this whole time! Like man... The emphasis at right spots..the excitement the explanation...The giggles..uff! ... It was like you are discovering this amazing phenomenon rn nd just being the cute curious kid describing it to us and we are awestruck at the same time! Got to listen to an explanation that seemed music to the ears after a longgg time...

[@VG__]

Sometimes I can't really believe that such an amazing content is accessible FOR FREE, like seriously without a single penny and they haven't even switched on "Monetization" on KZbin since it throws a tons of ads at students. Really unbelievable and soo sweet of Khan academic 🥺🥺❤️❤️🙏🙏🌺🌺🌺🌺🌺God bless you people.

[@khushiamin6074]

You are good human being... We like your skill

[@rahuls2111]

Sir I have a hypothesis in favour of WAVE nature of Light. The rationale that we use against WAVE nature of light is that Photoelectric Effect is a function of FREQUENCY. And observation of Threshold Frequency is hard/impossible to explain considering Light a Wave. However, FREQUENCY is related to WAVELENGTH (λ = v/f). So perhaps, Photoelectric Effect is not actually a function of FREQUENCY at all, but rather a function of WAVELENGTH. On similar lines, there may be a concept of Threshold Wavelengtb. I.E. wavelenth needs to be sufficiently small to enable INTERACTION with electrons of a candidate element. Would this perspective continue to support Wave Nature of Light? (without getting into fuzzy concepts like Photon and Duality)?

[@vaishalisathe3715]

Happy Guru Purnima Mahesh Sir and all lovely teachers at Khan Academy 💚. I have great respect for all of you .

[@michaelisrael9378]

Very underrated channel

[@1234ToddgMr]

Looks obvious to me that's the way it should be. This seems to be proving there are only waves not the reverse. Wave absorption is normal and common. Why do you need a particle? Your only making a wave look like a particle because of a lack of understanding of the full attributes of wave mechanics.

[@1dayfree]

Thank you for seeing past the bluff and nonsense of particle physics 💥

[@abhinavkumar8396]

Fantastic video explanation

[@bossyzedan5330]

Wonderful

[@TheAlexfrascari]

There is nothing weird about the photoelectric effect If you think in termos of resonance ....

[@henaa3104]

Mesh we waiting your videos too Much please upload fast

[@maryambahgat3752]

This is how to make learning so easy and interesting Thank you

[@aditiranjan927]

Thanks for a short but wonderful explanation

[@riyarai1086]

Thanks allot 👍😊

[@archishasingh9206]

Wow.... ❤loved your explanation

[@helloworld12321]

Thank you 😊 💓

[@mohamedkassim291]

Mahesh?

[@cnusrinivas226]

You are worth of having more than 100M subscription

[@medico3989]

Sir, after giving threshold frequency increase in intensity increase K.E?

[@rishikashresth6679]

Thankyou!!!

[@lokhimcheung9262]

imagine a shotgun. intensity is the number of pellets sprayed out, and the frequency is the bullet speed. the higher the intensity the more electrons hit out by the pellets. the higher the frequency the higher the electron shot out speed

[@gannesh_3000]

👏🏼

[@bookspa_4942]

he is a real gem 💎 ram

[@jahnaviseyreddy4815]

🤣😂🤣😂 will Never forget your awesome explanation sir🤣😂

[@rajeshnagpure3114]

2:30

[@rajeshnagpure3114]

Number 😂

[@varshavarsha8387]

But it is Albert Einstein who invented

[@रोहित007]

Sir please make lectures in Hindi.

[@leopardtiger1022]

Too much bla bla. Talk straight not with so many words.

[@vermasachin7762]

@ Mouroushi Hazra pw koi time waste nh hai mera bhai usi se padh ke neet me select huwa h 😏😏

[@noorvisions]

You're just great! telling the physics like a delightful story is just awesomeeeeee🥹

[@wetraccoonbetterthantrump]

So intensity is responsible for knocking electrons out and frequency is responsible for the kinetic energy with which they come out. But suppose we have a loght with high frequency such that if knocks the electrons in the meat of the conductor out even (deep inside), doesn't that mean frequency also determines the number of electrons leaving the conductor???