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Homework Help: Quantum Theory

  1. Jan 5, 2009 #1
    1. The problem statement, all variables and given/known data
    A certain photoelectric surface has a threshold frequency of 4.62 X 10^14 Hz.
    a) What is the photoelectric work function in joules?
    b) The surface is illuminated with light that has a frequency of 5.2 X 10^14 Hz. What is the kinetic energy of the electrons ejected from the surface? Answer in joules and electron volts.

    2. Relevant equations
    1 eV = 1.6 X 10^19 J
    W = hf

    3. The attempt at a solution

    a) 3.06 X 10^-19 J
    b) I need help on! I have no idea which equation to use, etc. Thanks!
  2. jcsd
  3. Jan 5, 2009 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Welcome to Physics Forums,

    You're answer to part (a) is spot on. Now for part (b), what is the definition of the work function?
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