How to calculate threshold frequency of a metal

[Justin Hawk]

Homework Statement

Determine the threshold frequency of a metal with a work function of 7V

Homework Equations

Threshold frequency 'f'=W/h where w=work function, h=planck's constant

The Attempt at a Solution

This is such an easy question, but I am hung up on how to treat a work function that is expressed in volts seeming as the equation used to calculate the frequency requires it to be in joules I believe. I understand that volts can be expressed as joules per coulomb, but what would I do about the coulombs then?

 

[NascentOxygen]

With one photon liberating one electron, you should convert from Joules per coulomb, to Joules per electron.