formula for stopping potential?

Your friend has given the correct relation along with it you can refer to the below given link:

https://www.meritnation.com/ask-answer/question/what-is-stopping-potential/dual-nature-of-radiation-and-matter/1875695

  • -2

eV0 =1/2 mvmax2    

where m=mass of photoelectron, vmax = maximum velocity of photoelectrons

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