Work function in photoelectric effect

[gracy]

The minimum energy required to eject an electron from the surface is called the photoelectric work function.To be precise to eject means force or throw (something) out
So energy equal to work function would surely eject an electron from metal surface
but according to the video below

At time 56:37 to 56:44 ,57:23-57:30 and at time 35 :26
it seems if metal is provided with energy equal to work function electrons would not come out from metal surface rather they will vibrate and come back to their positions.I think electrons should stand still just outside the metal surface when energy equal to work function is given?
Is it right?

 

[ZapperZ]

it seems if metal is provided with energy equal to work function electrons would not come out from metal surface rather they will vibrate and come back to their positions.

This is rather dubious. Why would it "vibrate"? We would have detected the radiation from such a vibration.

I think electrons should stand still just outside the metal surface when energy equal to work function is given?
Is it right?

No, that is not right. Do you not know about "image charge"?

Zz.

 

[gracy]

Do you not know about "image charge"?

No.I don't know!