Experimental setup & saturation current: photoelectric effect | Dual nature of light | Khan Academy

[@thanishas5215]

It is surprising that his videos are getting only few views😔.....what else we need...i literally say that he is the no.1 of the best tutors i have ever seen....he makes me to love each and every part of physics.... Thank you so much sir for ur videos...🙇‍♀️🙇‍♀️

[@hammadkhan5264]

I didn't like physics but when I take physics lectures of khan academy, especially with this guy it changed my mind and now I like the physics most❤️❤️❤️❤️

[@parahumour4619]

I love this method of teaching in which you make u figure out stuff by ourselves. Each video feels like a video game level...this channel deserves so much more views

[@harinimalla1647]

once again you make the statement true that '' a good teacher can make a topic more interesting " 'thank you, sir🙏

[@juliandesens]

Thank you for making the graph! It helped tremendously!

[@AnjiAnji-mh2qr]

Sir You are the only reason for my good scores and bringing interest in physics ❤😭

[@tolooklikeyou]

This guy’s excitement gets me excited to learn physics

[@SumanLata-c2i]

I can predict that this channel will bright one day like a sun 🏵️means lot of views and subscribers 🧿

[@Bill-xn9tp]

Very helpful. Great presentation. Beautiful.

[@lifeuncut4538]

Awesome teaching

[@Vijaykumar369S]

Hatts off you sir....very good and it's easy to understand.....do more video in all concepts

[@kabirsethi2608]

Very well explained sir

[@nottheinsomnia]

Thank you Mahesh bhaiyaa .

[@Diya-kb5uv]

Wow...true help for us 16 yo who have a big JEE ahead🙃

[@rajamajeed5257]

Best teacher...no worries ❤

[@newman8284]

great explanation

[@divy_maurya]

Wow, amazing

[@selin4393]

Thank you

[@xiaoruiwang4545]

excellent

[@tendi.rutsate]

Thank you so much wow!

[@ManojKumar-xk1wp]

we are increasing the potential the electrons speed also increases ,since i=nq/t u are saying n becomes constant but that does not mean q/t is constant then why current is getting saturation value

[@andrewjustin256]

This point also strikes me baffled! Have you been able to find the answer, Manoj? Please do tell me!

[@arhamdugar396]

i have a question by increasing the voltage, we have decreased the work function and increased the kinetic energy of the emitted photoelectrons so why does photocurrent become constant and does not increase as velocity of electrons will increase with increase in potential difference?

[@andrewjustin256]

I'm as puzzled as you are! Have you been able to find the answer? I can see Mr. Mahesh is not answering anyone's questions. If you have found the answer, please post it here!

[@naveenmydur9724]

Well explained

[@literallyfantastic2144]

Hey I love you.

[@shahusardar2762]

Thank youu

[@theoriginite7440]

If the voltage is increased further, will it lead to dielectric breakdown??

[@flip726]

Why does increasing the voltage increase the current here? Is it because you can treat it as a circuit and Ohm's law applies?

[@andrewjustin256]

You are correct 😊!

[@user-uc4ue5kl8i]

And also because if voltage is increased there will be more electrons collected. Flow of electrons produces current. More electrons more the current

[@VG__]

6:25 saturation current

[@dravikumar4401]

Here, in saturation current topic we have seen photon ejected almost all the electrons Then it must have efficiency like more than 90% right but why the efficiency of photoelectric effect is nearly 0.1%?

[@halumgrr]

As we increase the voltage, the collector receives more electron per second and also they're being attracted with much greater force than before(because of more voltage), so the electrons should be received and circulating in the circuit quicker than before, shouldn't that result in higher circuit current regardless of the fact that we cannot increase the no. of electrons received per second anymore? ( therefore no thing as saturation current). What point am I missing?

[@jerven1128]

i think that, even though the electrons are circulating quicker than before in the circuit, the current should still depend on how fast they travel through the air gap between the emitter and the collector, for ex if 100 electrons go from the +ive terminal to the emitter and the incident photons just have enough energy to emit 10 photoelectrons from the emitter, it will take 10 seconds for them to pass that gap and get to the -ive terminal, thus restricting the current to 10e/s even though the potential was enough to move 100 electrons. that sort of makes sense i guess????

[@rishavjain5087]

Path is broken dude ..the circuit is open...when u got the first batch of e- , they returned to the Zn plate....and can only pop out if they got energy from photons... Experiment's pretty full proof

[@andrewjustin256]

​@@rishavjain5087But still despite the fact the pathway is incomplete so is the circuit, electrons are still meandering from the negative to the positive terminal, so path is still connected. Morever, since the addition of the battery 🔋 added the positive and negative terminal, positive terminal might be attracting the electrons due to the electric field. Please inform me! I'm perplexed

[@andrewjustin256]

@halumgrr Have you been able to find the answer?

[@andrewjustin256]

​@@jerven1128But might the positive terminal not be attracting the electrons and so is the electromotive force forcing the electrons to be ejected?

[@fragon8188]

Fang-tastic 🔥

[@procrastinatingproductivel2031]

damn thank you sm

[@okellokennedy6048]

By setting up a pd (the collector being positive with respect to emitter)

[@sainidhikarthikeyan2291]

Actually speaking, saturation current/e gives the number of photoelectrons/sec right?

[@sitcomshorts8749]

If electrons are collected using voltage that would result in more electron that is to say the pulling out of electron would not be impartial to light now.

[@andrewjustin256]

My conjecture is identical as yours! Have you been able to find the answer? Please post it here; that shall be resourceful!

[@SiddharthMediratta-g6g]

I had the same doubt but I think I got the answer The collector is not connected by a wire, the electrons collected by the collector pass through a medium where only these electrons are there, they might not be using a conventional ammeterm. Now when we increase voltage, as there is no wire or something, only the electrons from the collector can pass. The no. Of electrons passing is so less that all of them pass through ammeter in 0.1 secs and there are no passing through it in rest 0.9 secs. When we increase voltage, no. Of electrons on collector inc... the voltage is only to attract the electrons that are flying away I hope you get it, it is very hatd to explain without a diagram

[@electroniciit9304]

what if the photoelectrons are just coming out with no kinetic energy . will the system still detect photoelectrons .

[@andrewjustin256]

If they are emerging out with zero kinetic energy, this infers they never actually exit the emitter! I hope it adds up since Mr. Mahesh is not answering anyone.

[@muneerkhan1176]

Collector is which metal sir.

[@andrewjustin256]

It's also my question! Have you been able to find the answer?

[@katyayani5643]

anyone from 23 batch?