- #1
teroenza
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Homework Statement
I have experimentally determined the work function from the intercepts of a fit line in graph of stopping potential (J) versus frequency (Hz). This is from a photoelectric effect lab. The value of the intercept, which I believe is that of the work function, is returned as negative. (the "a" value in the boxes). I know I am getting hung up mentally on a simple sign issue, but why is this value negative? Is this a sign convention indicating energy must enter the material to knock particles (electrons in my case) off?
Homework Equations
y= bx +a
Stopping Potential = h*frequency - work function
The Attempt at a Solution
My graph is attached.