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How to calculate threshold frequency of a metal

  1. Oct 31, 2011 #1
    1. The problem statement, all variables and given/known data
    Determine the threshold frequency of a metal with a work function of 7V

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

    3. 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?
  2. jcsd
  3. Oct 31, 2011 #2


    User Avatar

    Staff: Mentor

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