Stopping potential & maximum kinetic energy | Dual nature of light | Physics | Khan Academy

Stopping potential is the minimum negative voltage applied to the anode to stop the photocurrent. The maximum kinetic energy of the electrons equal the stopping voltage, when measured in electron volt.
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Created by Mahesh Shenoy

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Question: Will the photoelectric circuit act as a cathode ray tube if we provide high voltage?

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[@spurti]

Hii I have a question why maximum kinetic energy is equal to the potential energy that is Kmax=eV

[@mr.pirate6026]

Think it as you need to subtract 4 from 4 in order to get a null value and thus the energy per coulomb must be equal to the kinetic energy in order to stop the electrons

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Basicly you can determine the max number of electrons that flow but not the actual number of electrons?

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Great sir But i don’t understand that why some electron will have high K.E and some have small K.E although light are same on both

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I've never seen all positive comments on a video

[@Bharani204]

I have a doubt when change the polarity emitter plate gets fully positive then it will attract the electrons that are repelled by the collector plate then how to find kinetic energy?

[@RajPrasad-j4t]

The setup is same as charging/discharging of capacitor, my doubt is that why the ammeter would only measure the emmited electron , wouldn't it also measure the electrons the battering is removing from one plate and moving to other in order to establish same potential accross the plates , is there something that I'm missing?? Please clear my doubt

[@임채원-r2i]

I got an question kmax= 3J/C x 1.6 x 10-19 in this case, why using 1.6x 10-19 instead -1.6x 10-19

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-ve sign indicates the charge on electron (sign) 1.6 x 10¹⁹ is magnitude

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Sir what will happen if the energy in photon and the energy required for the electron to get out of the metal are the same ?

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Electrons will emit but with 0 kinetic energy.. Getting it

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@Veda Jyo ..i had the same doubt and got it clear,..that is the electrons will be just ready to jump off..to get emitted..but wont

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energy in the photon has to be greater than the energy required for the electron for the electron to be emitted.

[@MhmdK0030]

As what FREAKS said: photon is absorbed and electrons will be emitted with zero speed

[@meenukarunakaran4644]

Hi, I have a doubt. How do we understand number of electrons from photocurrent?

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Actually why should we stop those electrons browhat is it's need what can we conclude with it...

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He is the one who teaches floatheadphysics , his name is Mahesh Shenoy, he teaches in both Khan acedmy as well as he has his own channel

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You can also go into the discription of this video in which it is written that the video is created by Mahesh Shenoy

[@VG__]

7:33

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[@kksingh768]

At 1:48 What does the Ip on the y-axis graph mean?

[@daddyfrhuh]

Photocurrent

[@udayammanikumaran9744]

photo electric current measured by micro ammeter in the diagram

[@UPDATEIQ]

Why k max is calculated for only one electron not for all

[@days4926]

cuz not all electrons have the same amount of energy, and as stated the many other electrons might not have traveled all the way to the collector which would make the Vo vary, so we are trying to find only the maximum energy off of these electrons.

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