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**What am I finding to be confusing..**

The graphs of Millikan's data were straight lines with equal slopes. The graph was plotted maimum kinetic energy (eV) versus the frequency of the wave. This was the graph that produced the linear relationship from the photoelectric effect.

What does it mean on the graph when it is below the x-axis? The y-axis is the maximum kinetic energy, so if the y-values become negative, what is happening to the maximum kinetic energy?

I understand that the y-intercept is for the work function of the metal, and that the x-intercept accounts for the threshold frequency, but I am confused as to what is the meaning behind "negative maximum kinetic energy" in the linear relationship.

**Equation:**

Ek(max) = hf - W