Answer
As the frequency $f$ increases, the maximum kinetic energy of the ejected photons also increases.
Work Step by Step
We can write an expression for the maximum kinetic energy:
$K_{max} = hf - \phi$
We can see that as the frequency $f$ increases, the maximum kinetic energy of the ejected photons also increases. This is quite intuitive as higher frequency photons have more energy than lower frequency photons.
