- #1

jasdell

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## Homework Statement

a student carried out a photoelectric experiment by shining visible light on a clean piece of cesium metal. She determined the kinetic energy of ejected electrons by applying a retarding voltage such that the current due to the electrons read exactly 0. The condition was reached when eV=(1/2)(m sub e)(velocity)^2 where e is electric charge and V is the retarding potential. Her results are as follows:

wavelength / nm---405-------435.8----480------520-----577.7----650

V / volt-----------1.475------1.268----1.027----0.886---0.667----0.381

rearrange equation to read: frequency= (phi)/(h) + (e/h)V

determine the values of h (planks constant) and phi (work function) graphically.

## Homework Equations

The equation the book rearranged was hv=(phi)+ (1/2)(m sub e)(velocity)^2

In class the following day our teacher gave us the equation that I believe he some how derived from the rearranged equation: 1/wavelength=(c/h)(eV)+ c(phi)/h^2 or h2 my notes were hurried and I can't really tell... not to mention I just don't see how either one could be derived unless I'm missing something (probable)

## The Attempt at a Solution

I've tried playing with it some but I really don't know where to start with this question.

I'm not even positive what it is asking for. I assume its asking me to find plank's constant and the work function from the data given but am I supposed to make a scatter plot of my results or what?

I think I'm just having trouble wrapping my brain around exactly what it wants and trying to find a method of attack.

Any help on this would be extremely useful