- #1
ishterz
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Homework Statement
Em radiation of frequency .88X10^-15 Hz falls upon a surface of work function 2.5 eV.
A)Calculate Max KE
B) If a nearby electrode is made negative with respect to the first surface using a pd V, what value is required for V if it is to be just sufficient to stop any of the photoelectrons from reaching the negative electrode?
2. The attempt at a solution
I got part A as I did Max KE = hf + work function energy in joules = 9.81x10^-19
I'm not too sure about part b, is the stopping potential just 2.5 eV then?
Thank you :)