What Does the Graph of Ek,max(f) = hf - E0 Look Like?

[carl]

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the maximum kinetic energy of a photoelectron, Ek,max , to the smallest amount of energy, E0, needed to free an electron from the metal, and the energy, Eph , of the incident photons of light:

Ek,max = Eph – E0

In addition, you know from Equation 10.1 that Eph = hf where h is the Planck constant and f is the frequency of the incident light.

Which one of the following graphs represents the relationship between Ek,max and f ?

attachment of graphs is attached.

thanks trigger.
Attached Thumbnails

 

[adriank]

What does the graph of E_k,max(f) = hf - E₀ look like?