Use the graph below to answer the following question:

Graph titled maximum kinetic energy of ejected photo electron versus incoming frequency is shown. The y axis is labeled maximum kinetic energy and scales from negative 3 to positive 3 electron volts. The x axis is labeled frequency from 0 to 11 times 10 to the 14 hertz. A line connects the points 0, negative 2 and 2.5, negative 1 and 5, 0 and 8, 1 and 10, 2.

If you use a different experimental photo-missive material, what would be the same on the graph?

The y-intercept
The x-intercept
The slope
The maximum kinetic energy of the photoelectron