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Homework Help: Photoelectic effect and units

  1. Jun 16, 2016 #1
    1. The problem statement, all variables and given/known data
    HI, I have this photoelectric effect problem, it is not so difficult but when i got to the units and red about it , i got confused.
    The Problem : Photo-electrons are completely hold up by electric potential with potential of 3V. The work function is given. I have to calculate the incident light frequency.

    2. Relevant equations

    3. The attempt at a solution
    So the equation is

    And the units are
    This does not work. So I thought lets convert them to eV which is possible for [J].
    But when I start to think about the V -> eV its gets confusing because V are not measurement of energy but eV are.

    So what do you think guys, can I just do the conversion from [v] to [ev] by multiplying V by e or it is wrong?
  2. jcsd
  3. Jun 16, 2016 #2


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    Science Advisor
    Gold Member

    Emax does not denote the stopping potential, but the kinetic energy of a photoelectron. You need to find the relationship between electric potential and energy of a charge in a field.
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