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This is the question I got for an assignment.

How do I determine stopping potential from this data? I can see that the relation between $V$ and $I$ seems to be linear, so can I just use the equation of a line between $V$ and $I$ to find the stopping potential? Or is there another way to solve the question?

My main question, however, is: Is the relationship between $V$ and $I$ actually linear?

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