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Homework Statement
Photons of energy 12 eV are incident on a metal. It is found that current flows from the metal until a stopping potential of 8.0 V is applied.
If the wavelength of the incident photons is doubled, what is the maximum kinetic energy of the ejected electrons?
Homework Equations
I am absolutely clueless. I feel like I'm supposed to use KE = hf - W but how am I supposed to know the frequency if it isn't given? So I don't think I'm supposed to use this one.
Please just lead me towards the right direction. I don't have a clue as to which equation to use.
The Attempt at a Solution
This question is gibberish to me and I don't know how to even approach it. Please help.