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1. The problem statement, all variables and given/known data

If the photocurrent of a photocell is cut off by a retarding potential of 0.92 volts for monochromatic radiation of 2500 A (A with the little circle above it), what is the work function of the material.

2. Relevant equations

My book and professor use different symbols so I am going to define the symbols I am using:

Ø means retarding potential / stopping potential

W means work function

e Ø = hc/lambda - W

hc = 1240 eV

3. The attempt at a solution

radiance is invariant with lambda b/c monochromatic

According to the graph of photocurrent i vs. anode voltage V, it is when V = -Ø that i goes to 0. I don't see where 2500A fits in, except that that must give me lambda so that I can solve for W in the equation above.

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# Homework Help: Photoelectric effect, retarding potential

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