Finding Maximum kinetic energy of ejected electrons

[pleace]

Homework Statement

So i know the light colour, wavelength, cutoff potential and frequencies. I am trying to find the maximum kinetic energy of the ejected electrons(J or eV)
heres the first set of numbers for the colour of yellow:
wavelength 578nm(5.78 x 10 to the -7metres). cutoff potential 0.25v. Frequency= 5.19 x 10 to the 14 HZ

Homework Equations

E= hc/λ

The Attempt at a Solution

so i started to think that i was supposed to use the equation e=hc/λ. but it is not getting me the right answer. i think this might be because the "E" is just total energy and not kinetic, but i have no idea what to do. Please help

 

[ehild]

Read about photoelectric effect. For example: http://en.wikipedia.org/wiki/Photoelectric_effect#Mathematical_description

ehild

 

[harts]

http://theory.uwinnipeg.ca/physics/quant/node3.html