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## Homework Statement

(Given a voltage against frequency graph)

Calculate the work function of Sodium and state any assumptions you have made.

My question is, what assumptions have I made?

## Homework Equations

hf = work function

V = IR

## The Attempt at a Solution

I know on a Voltage against Frequency graph, the x intercept is the threshold frequency as it's the point where there is no kinetic energy given to the electrons to produce a current as V = IR, and so I can use

hf = work function, to calculate work function.

However I'm not sure what I'm assuming in this process, and I'm sure it's not something like 'Assuming the data is correct'