Class 12 Physics | Photoelectric Effect | #14 Experimental Study | For JEE & NEET

[@HarshitKumar-bb2mu]

all doubts.. cleared.. thnx.. after watching checklist.. and then conept vid. its became much easier to get depth feel of concept.... i love u sir... ❤

[@vishalshingade4445]

Thank you for uploading this video.

[@nitianaryan314]

Where are you now ?

[@josh15h3r3]

Where are you now?

[@virenkundnani5320]

Where are you now?

[@TravisKardashian]

Where are you now?

[@yogeshyograj3997]

thanks sir fr helping us

[@mannukumar9702]

Sir, as you said the no. Of e'will remain same and its velocity increases . So , current remain same. Doubt:- if velocity increase then the current should also increase because i=dq/dt , and ( 'v' inversely proportional 't')

[@Praveensingh-et1og]

Does increase in velocity anyway affect dq..?..It would remain same..

[@virendrachouhan1554]

Praveen Singh no dq will not change but the time change .

[@Praveensingh-et1og]

@@virendrachouhan1554 current has no relation with "speed of charge carrier"..

[@vaidehibaranwal9245]

dt is per unit time. It will remain same.

[@timepasstimepass-p3m]

@physicsgalaxy sir can u please tell me how u equated kinetic energy with work done u wrote ke min = 0+ev how can we equate energy with work done.. Please reply sir.

[@A_PROUD_SANDALWOOD]

the work done by battery on electron is stored in form of KE by electron.. also energy and work done can be equated as they have same dimensions and units

[@ascyrax8507]

doubt-----after the voltage gets negative,i.e. electrons are ejected from anode...then why does photocurrent exists at all? why does the anode absorbs the electrons reaching it and constitute the photocurrent at all? [Shouldn't electrons be repelled by the negatively charged cathode? Even when the stopping potential hasn't been reached the electrons that reach the cathode why does it get absorbed by he cathode into the photocurrent?

[@arunteltia7888]

Sir why positive is anode ya i know its a fundamental doubt but everytime i forget as in chemistry anode is negetive in electrochemistry

[@MominParveez]

most of my doubts were cleared after watching this but sir if u please clear this doubt...in the first case as u said after saturation current is achieved if we increase the volatge only KE will increase fair enough.. but sir to my knowledge as KE is increased implies electron will travel faster which means electrons flown per time will also increase .. that actually is current ..hence even if at Vp every ejected electron is flown in ckt but due to continues increase in KE their flowing speed will increase which implies now per unit time more electrons will flow in ckt that is current in the ckt is further increased. thanku

[@therock2730]

Momin Parveez same problem sir plz

[@physicsgalaxyworld]

No... Just think in this way - If in one second total 20 electrons are emitted then maximum only 20 electrons can reach the other terminal in one second so current will be 20e, it does not change the current value (charge/second) with the speed of charge... hope it is clear to you...

[@anmolempire1197]

@@therock2730 as mathematically Current= dq/dt nothing to do with absolute speed of moving electron

[@agniveshb4326]

Sir in previous lecture when velocity of electrons was increased by increasing the frequency, current was constant. But here when velocity was increased by increasing the potential current was increased.. Sir help

[@shr1126]

Bhai video number 9 me mera explaination dek! Comments me

[@divypareek678]

Sir if we increase the potential difference over a certain value,sir eventually will more current start to flow even if saturation current is reached as the potential difference has crossed as certain value from which even the electrons from inner side will start to flow due to electrostatic force of attraction instead of PEE

[@okkk477]

Ohyeayeapikapu

[@lubomirvlcek9888]

Hi , A particle moving in a transmission medium. Kinetic energy of a particle ( charge) moving at the velocity of v has two different values: Kinetic energy of a particle ( charge) Tkin id =mc^2 [ln |1-v/c|+ (v/c) / (1-v/c) ] in direction of motion of a particle ( charge) It is realy as Newton´s kinetic energy, where v is velocity of a particle ( charge) . Kinetic energy of a particle ( charge) Tkin ad = mc^2 [ln |1+v/c|- (v/c) / (1+v/c) ] against direction of motion of a particle ( charge) It is realy as Maxwell´s electromagnetic wave energy, where v is velocity of a particle ( charge). Corrected Third Newton's law of motion : All movements in physics are based on principle of action - reaction and on velocity of stable particles ( e-, p+,n0, D, He-3, α ). Action, as a motion of stable charged particles ( e-, p+,n0, D, He-3, α ), is characterized speeds up in source along ellipse or quasi- elipse ( excentricity e -> 0 ). Action creates unstable particles ( leptons μ−, τ−, baryons, mesons ), bosons W +, W-, Z (= particles = β electrons moving at nearly the speed of light )in direction of motion of stable particles ( e-, p+,n0, D, He-3, alfa ). Reaction creates into transmission medium, the electromagnetic waves, as unstable “particles” - neutrínos νe, νμ, ντ , mesons π0, π+ , π- , η , K and gamma rays (=waves of extremely high frequency >1019 Hz ) - against direction of motion of stable particles ( e-, p+,n0, D, He-3, alfa ). Accompanying activity of reaction on movement of stable particles in the transmission medium are waves, or “unstable particles“ respectively , i.e. neutrinos and mesons. vixra.org/author/lubomir_vlcek Extraordinary proofs: vixra.org/pdf/1506.0207v1.pdf New Trends in Physics CD Rom /book, Elementes Pictures, Spheres in Nuclei, Forecasted Nuclei vixra.org/pdf/1504.0082v1.pdf One Blink of Electron is the Basis Amount of Kinetic Energy 6.62606957x10-34 Js vixra.org/pdf/1503.0056v1.pdf Confirmation of the Theory Under Discussion Wave-Particle Duality as Kinetic Energy Against and in Direction of Motion in Discussion Group Theoretical Physics !!!! Eureka !!!! vixra.org/pdf/1502.0184v1.pdf Einstein's Theory of Relativity Can not Explain ... vixra.org/pdf/1501.0199v1.pdf Corrected Newton´s Laws of Motion vixra.org/pdf/1501.0198v1.pdf Principles for the Theory and Its Agreement with Experiment vixra.org/pdf/1501.0197v1.pdf Wave - Particle Duality as Kinetic Energy Against and In Direction of Motion. vixra.org/pdf/1412.0131v1.pdf Improvement of Classical Physics vixra.org/pdf/1412.0125v1.pdf Kinetic Energy According to Einstein and According the Latest Knowledge vixra.org/pdf/1411.0533v1.pdf Form of Intensity of the Moving Charge Electric Field is Asymmetrical. vixra.org/pdf/1411.0531v1.pdf Form of the Interference Field is Non-Linear vixra.org/pdf/1411.0530v1.pdf Kinetic Energy of a Charge Moving at the Velocity of V Has Two Different Values vixra.org/pdf/1409.0090v1.pdf Three Objections to Modern Physics vixra.org/pdf/1408.0185v1.pdf Protons Are Perfectly Stable or Their Lifetime is Enormous vixra.org/pdf/1408.0133v1.pdf Please Read my Articles in More Detail. vixra.org/pdf/1405.0355v1.pdf Movement Principles of Ufo vixra.org/pdf/1405.0334v1.pdf Kinetic Energy vixra.org/pdf/1405.0308v1.pdf Who is Right? vixra.org/pdf/1405.0307v1.pdf What is Quark? vixra.org/pdf/1405.0237v1.pdf L.vlcek Vixra, Getcited, Book, CD, Conferences 14.5.2014 vixra.org/pdf/1404.0471v1.pdf Superheavy Spherical Nuclei. Island of Stability vixra.org/pdf/1404.0369v1.pdf Neutrino Oscillations vixra.org/pdf/1404.0279v1.pdf Physics is Easy vixra.org/pdf/1404.0273v1.pdf Particles, Waves and Trends in Physics vixra.org/pdf/1404.0268v1.pdf Physics is Beautiful vixra.org/pdf/1404.0261v1.pdf Introduction to my Two Articles Physics is Easy and Physics is Beautiful vixra.org/pdf/1404.0253v1.pdf Orbit Radius and Speed of the Sun Around the Center of Gravity of the Solar System vixra.org/pdf/1404.0248v1.pdf Spectral line Hα vixra.org/pdf/1404.0246v1.pdf Shortened Great Table of Elementary Particles vixra.org/pdf/1404.0243v1.pdf Great Table of Elementary Particles vixra.org/pdf/1404.0238v1.pdf Movement Principles of the Fast-Spinning Bodies vixra.org/pdf/1404.0130v1.pdf Nuclear Fusion Critical examination of fundamentals in physics www.trendsinphysics.info/ academia.edu tuke.academia.edu/LubomirVlcek L. Vlcek, : New Trends in Physics, Slovak Academic Press, Bratislava 1996, ISBN 80-85665-64-6. Presentation on European Phys. Soc. 10th Gen. Conf. - Trends in Physics ( EPS 10) Sevilla , E 9. -13 September 1996, www.trendsinphysics.info/ vixra.org/pdf/1502.0184v1.pdf Einstein's theory of relativity can not explain ... Abstract 1. Movement principles of the fast-spinning pulsars, (vixra.org/pdf/1404.0238v1.pdf Movement Principles of the Fast-Spinning Bodies ) 2. Nuclear Fusion , ( vixra.org/pdf/1404.0130v1.pdf ) 3. Wave - Particle Duality as Kinetic Energy Against and In Direction of Motion 4. the 4th Maxwell's equation, (2.38) in www.trendsinphysics.info/kniha/2-1.html#2-1-3 5. Lorentz equals without the help of Space-Time, (2.23) - (2.27) in www.trendsinphysics.info/kniha/2-1.html#2-1-3 6.Confinement of quarks (vixra.org/pdf/1405.0307v1.pdf What is Quark? ) 7. Great Table of Elementary Particles ( vixra.org/pdf/1404.0243v1.pdf ) 8. Spectral line Hα ( vixra.org/pdf/1404.0248v1.pdf ň 9. Neutrino Oscillations ( vixra.org/pdf/1404.0369v1.pdf ) 10. Form of the interference field must be non-linear. ( vixra.org/pdf/1411.0531v1.pdf ) 11.Form of Intensity of the Moving Charge Electric Field must be asymmetrical. ( vixra.org/pdf/1411.0533v1.pdf ) 12.Kinetic energy of a charge moving at the velocity of v has two different values: Kinetic energy against direction of motion as wave Tkin ad = mc2 [ln |1+v/c|- (v/c)/(1+v/c)] Kinetic energy in direction of motion as particle Tkin id = mc2 [ln|1-v/c|+ (v/c)/(1-v/c)] ( vixra.org/pdf/1411.0530v1.pdf , vixra.org/pdf/1405.0334v1.pdf , vixra.org/pdf/1409.0090v1.pdf Three Objections to Modern Physics ) 13. Yukawa potential 1905 A.E. : Einstein ´s theory Tkin =mc^2 - mo c^2 1996: Tkin id =mc^2 [ln |1-v/c|+ (v/c) / (1-v/c) ] Tkin ad = mc^2 [ln |1+v/c|- (v/c) / (1+v/c) ] Einstein's theory works for v < 0.1c. v/c.......Tkin ad .................Tkin id ...............Tkin (A.E.) 0.1..... 0.00439 mc^2...0.0057 mc^2....0.0050 mo c^2 0.2.....0.0156 mc^2.....0.0268 mc^2......0.0200 mo c^2 0.3.....0.0316 mc^2.....0.0719 mc^2......0.0480 mo c^2 0.4.....0.0508 mc^2.....0.1558 mc^2......0.0910 mo c^2 0.5.....0.0722 mc^2.....0.3068 mc^2......0.1550 mo c^2 0.6.....0.0950 mc^2.....0.5837 mc^2......0.2500 mo c^2 0.7.....0.1174 mc^2.....1.1293 mc^2.......0.4010 mo c^2 0.8.....0.1434 mc^2.....2.3905 mc^2......0.6670 mo c^2 0.9.....0.1680 mc^2.....6.6974 mc^2......1.2930 mo c^2 0.99...0.1906 mc^2....94.3948 m^c2.....6.9200 mo c^2 1……....0.1931 mc^2..........infinite....................infinite www.trendsinphysics.info/ Why relativity works in some cases and fails in others ? Like Newton's theory works for small speeds v

[@ayushgupta4077]

Lubomir Vlcek whats??

[@ExplodingVibes1]

At pich off voltage since photons beam are contiously incident on the metal surface so why the number of electrons become constant???

[@BabluSingh-er5rh]

Just a small doubt sir. Does intensity depends on the frequency? What does changing frequency keeping intensity constant indicate? Please help sir.

[@physicsgalaxyworld]

Intensity is the total energy flow per sec per unit cross sectional area whereas frequency determines energy of each photon so intensity and frequency are related as I = Nhv where N are no of photons per sec per unit area...

[@BabluSingh-er5rh]

Thanks sir. My doubt arised from Objective 2 of HC verma..question no. 1

[@cosmolearner5562]

@@BabluSingh-er5rh you can compare intensity with brightness of the same light (suppose yellow), as its same light so frequency is same if we increase brightness intensity increases!

[@virendrachouhan1554]

Sir if speed will increase then more no. Of elecyron will travel in less time so current will be more.

[@prabhatkumarverma200]

nicely explained sir.

[@aditi6631]

Sir stopping potential and retarding potential aren’t different?

[@aditi6631]

I mean to say, Stopping potential: MINIMUM potential for which current is 0. whereas retarding potential is negative potential of anode with respect to cathode which is less than stopping potential.

[@guptapuneet94]

really very very helpful.thankyou

[@stable577]

To be revisited

[@nitianaryan314]

Reviewing concepts for adv thankyou sir for wonderful lectures

[@alphaiitd1]

Thanks sir

[@vijayvyas5075]

sir what if the electrons with minimum 0 kinetic energy gain sone more kinetic energy due to collision? Then net kinetic energy on reaching the other terminal will be more than eV. Same applies to the electrons with maximum kinetic energy, their final kinetic energy on reaching the other terminal will be more than eV+1/2mv^2. sir please clear my query. thanku so much.

[@shreyanshgoel9757]

Sir, you haven't discuss davission germer experiment

[@ayushgupta4077]

at 8:21 dir of current will be opposite......

[@sudoupdate]

Sir After pinch off volatage, if we further increase voltage, current should increase as rate of flow is increasing

[@physicsgalaxyworld]

No only speed is increasing not the rate of flow... as charge emitted per unit time from other terminal is constant...

[@sudoupdate]

Physics Galaxy thanks sir I got it now

[@mrobjectoriented]

Is the direction of current correct at 8:19?

[@physicsgalaxyworld]

Direction of current is opposite to flow of electrons....

[@arunteltia7888]

So sir the direction is incorrect right

[@arunteltia7888]

Sir do u want to say that we treat the voltage positive which support the flow and and negetive which oppose the flow

[@deepakpaliwal3564]

4:38.... battery configuration is same..but u said reverse..

[@RahulPandey-rc9in]

Sir not able to understand .. experiment of PEE with reverse voltage.. it is in jee mains ?

[@ayushgupta4077]

Rahul Pandey yeah

[@bhaskargaddam8834]

How voltage is effecting the electrons flow?

[@AliAli-yn1ks]

please if the window is glass why it absorbes UV RAY thank you very much

[@babitashukla2298]

#Physics galaxy sir what if we further decrease the potential beyond stopping potential ??

[@cosmolearner5562]

same doubt,you mean increase more -ve potential; i think current will still remain 0 as we move more -ve potential

[@jayrashamiya7706]

Sir, on increasing voltage you said that speed of electrond increses, doesn't that mean that charge passing through an area in unit time increases.so current increases?

[@physicsgalaxyworld]

No... by speed of electrons the time these are taking in reaching anode will be decreasing but saturation current depends upon the total number of electrons emitted from the cathode per unit time... which will not change by increasing the speed of electrons so charge per unit time through any cross sectional area will remain same...

[@Haripriya-fn7fg]

Sir can u explain it again

[@universeguy4771]

@@Haripriya-fn7fg Did you clear iit? And also I hope you are doing well in life

[@arunteltia7888]

Sir why it not behave like capacitor

[@ascyrax8507]

cz in capacitors electrons dont move from one plate to another...but here we have photons of sufficient energy which can produce photoelectrons and hence charges dont remain accumulated at the plates.

[@prabhatkumarverma200]

Sir should not pinch of voltage be same in both cases ??... Reply faster

[@physicsgalaxyworld]

No these will slightly differ as total electrons differ so space charge also differ...

[@prabhatkumarverma200]

Physics Galaxy ..Electronic will differ....So what?

[@abcd7566]

Sir,At stopping potential will the photoelectron emission becomes equal to zero ?

[@physicsgalaxyworld]

No... electrons will emit but not reach the other terminal so current in circuit becomes zero...

[@shivajikendre3941]

Thanks sir. But main uses of photoelectric effect

[@physicsgalaxyworld]

Didn't get what you'd like to ask... pl specify...

[@therock2730]

Sir why current does not increase as we increase potential after saturation point

[@SoI_JEE_NEET_Physics_Math_IITB]

current = number of electrons ejected from metal in 1 sec / ( 1 sec + time taken to travel from -ve plate to +ve plate). Travel time can be reduced to almost zero by increasing potential, which happens at saturation point. Beyond that, current = number of electrons ejected from metal in 1 sec / ( 1 sec ) which is not dependent on potential any longer !!

[@vivekdhaka2201]

Thank you very much

[@vivekdhaka2201]

So actually the current we are talking which becomes constant is photoelectric currrrrenttt

[@ritapattnaik4359]

sir why pinchoff voltage increases on increasing intensity??

[@physicsgalaxyworld]

Due to increase in photon flux pinchoff voltage increases slightly...

[@ritapattnaik4359]

sir could pls explain a bit more..is it because of a greater electron cloud size and hence it requires more voltage to be pulled???

[@anmolempire1197]

@@ritapattnaik4359 as voltage is increased cathode will more strongly pull the electron towards itself and hence eventually weak electron cloud under such strong attractive influence will also attracted and hence number of moving electron increase impilies number of charge moving per unit time also increase..Hence current increase

[@iitroorkee-hp8qp]

Is anyone here in 2024😊

[@AshokKumar-qi4nr]

Sir what does + and - charge on plates in the tube signify.

[@physicsgalaxyworld]

high and low potential terminals...

[@kuldeepsrikar7465]

sir canu pls explain y we are adding ev wile it is the work done

[@physicsgalaxyworld]

Yes it is work done on electrons by the battery that's why KE will increase by this amount...

[@ishangupta9386]

me in first 13 lectures: arey easy chapter me after 13th lecture: no so easy chapter

[@shivanshpandey7957]

🙌🙌🙌🙌

[@KaranDoshicool]

How does the distance d between the electrodes affect the experiment?

[@physicsgalaxyworld]

At large distance between electrodes the electron beam may get diverged and affect the overall experiment...

[@subhankarmishra5422]

11:09 sir is it maximum negative potential or minimum negative potential?

[@cosmolearner5562]

Ya it should be min., sir made mistake

[@sankethshetty6306]

Sir have you left allen

[@iamsomali5529]

I think he is speaking english and other language,isn't it???

[@kushalchakrabarti240]

dude, next time take a nap before recording

[@arunteltia7888]

Dude u can watch it on global accent and plz give respect to the sir

[@mayur6374]

tum jase bande kisi ke sage nhi hote ... u dont know what he is doing for youth .he is one of the best teacher for physics in world.. lekin bandar kya janne aadrak ka swad

[@mayur6374]

bhai agar isko itni samaj hoti toh yeh comment krta hi nahi

[@deepakchandravanshi6274]

I think u should take a nap before commenting like this. .. . .....naive

[@ayushgupta4077]

nice arun,mayur,deepak

[@roneet9027]

thank you sir