Photoelectric Effect - Structure of Atom | Class 11 Chemistry Chapter 2 | CBSE/JEE/NEET (2022-23)

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[@UTKARSHUNESCO]

GOOD MORNING SIR ,WHAT IS THE DIFFERENCE BETWEEN ( THRESHOLD ENERGY AND FREQUENCY) BECAUSE THE BOTH HELP TO CUT THE FORCE OF ATTRACTION BETWEEN NUCLEUS TO ELECTRON ) BY THIS AN ELECTRON CAN EMMITED OR RELEASE FROM METAL SURFACE ☺️

[@TanishqSrivastava]

In Eo= hvo, Eo is threshold energy and vo is threshold frequency.... Their difference is the same as the difference between energy and frequency.

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How photoelectric effect related with particle nature of emr ?

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41:05 sir if we supply sufficient kinetic energy for the electron so that it eject with its kinetic energy instantly without waiting then the graph must touch the origin then in that case graph will vary.... Won't it be wrong then

[@krish6925]

The thing is that the x axis is for light frequency or emr frequency and the fact that it doesnt start from origin it is so because the frequency of emr is less than that of threshold frequency

[@summydays411]

the point is that some threshold frequency is used for ejection of electrons on the surface of the metal so at that point kinetic energy will be zero...but at frequency greater that threshold on xaxis will give electron some velocity so therefore kinetic energy will also increase.

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sir, hamare sir btaya hai ki itensity=no. of photons but aap bta rhe ho ki intesity brightness hoti hai. Isme confusion ho rha hai sir.Please reply🙏

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Intensity yani no of waves and it's also related to bright ness

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Sir, koi metal ka threshold frequency kitna hoga; ye kaise pata karege??

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[@ashwiniprajapati1413]

but sir agar EMR ke pass bas thresold energy jitni energy hogi to kya hoga , electro ko kinetic energy nahi mil payega kuki supplied energy to thresold me khatm ho jayega

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That's why we use energy of sightly higher frequency

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Garuri nahi h ki hum electron ko enject karvane ke lie threshold energy gitni hi energy supply kre but kinetic energy ke process ko start krne ke lie hme threshold ke equal energy pass kni pre gi

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26:35

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Sir please tell , Is there any relation between intensity and Frequency of EMR

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Sir already told that .... Whenever we increase intensity so their will be no change in KE. so, again their will be no change in EMR although wherever frequency is increased so KE will also increase that means KE is directly proportional to frequency and u can say that KE is directly proportional to EMR may be 😅

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There would be no change in the frequency. Increase in Intensity just means that there is an increase in the number of photons.

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Sir apne bahut acha explain kiya , pr ye ni btaya ki threshold ka kya mtlb h , ye eintien k naam se b to ho skta tha , jaise dusri chize hoti h chemistry me ? , sir bta do plz

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Threshold ka matlab hota hai The point at which you start experiencing something 🤔 isliye iska naam Threshold frequency hai.

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Sir why light intensity is directly proportional to no. of electron??

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if you will increase intensity it means ur increasing nos of photons and they will knock out more electrons so thats y

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Best lecture ever on photoelectric effect

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Sir kinetic energy aur frequency me independent quantity kon h??🤔🤔

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Thank you for your comment! The answer to your question is that kinetic energy is an independent quantity, while frequency is not.

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Sir why the no. Of electron changes due to change in Intensity of light?? Please tell

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[@Abhinava_Ramanath]

Abhishek sir, I've a doubt regarding the graph of photoelectric effect. You mentioned that the frequency is assumed to be greater than the threshold frequency whenever sums concerning photoelectric graph is asked. Why can't it also be equal to the threshold frequency? Even then photoelectric effect occurs naa? So, shouldn't it be "greater than and equal to" threshold frequency? Please clarify fast sir!

[@harshtheffgamer3487]

hi brother if threshold frequency will be equal to frequency then electrons will knocked out but the dint have any kinetic energy then there wil be ni use of iit

[@Abhinava_Ramanath]

@@harshtheffgamer3487 Oh right. Thank you bro. Didn't notice that!

[@summydays411]

photoelectric effect will occur at threshold frequency the kinetic energy will remain zero thats why frequency is taken to be greater than threshold frequency

[@divyanshsingh4856]

Sir what will happen if threshold frequency is exactly equal to the energy we supplied in the form of EMR as of we calculate kinetic energy of electron here then it will be zero???

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Yes, it will be zero.

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yes it will be zero because there is no excess energy to provide velocity to the ejected electron

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@@avishekanand9372 Avishek u r totally confused ..... actually speed and velocity has some differences ...... EMR ki speed same hoti hai and according to frequency velocity change hoti hai .....

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