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Negative Work function in Photo electric effect

  1. Sep 22, 2011 #1
    1. The problem statement, all variables and given/known data

    In my attachment, the x intercept gives threshold frequency and the y intercept gives the work function.

    2. Relevant equations



    3. The attempt at a solution
    Work function is the minimum energy needed to pull out an electron from the metal surface. My question is, from the graph, work function is a negative value. Will work function takes negative values?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Sep 22, 2011 #2

    Doc Al

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    Staff: Mentor

    The y intercept gives the negative of the work function. (It's even marked -Φ on the diagram.) The work function is positive.
     
  4. Sep 22, 2011 #3
    Doc Al,
    How negative of the work function becomes positive work function.
     
  5. Sep 22, 2011 #4

    Doc Al

    User Avatar

    Staff: Mentor

    The work function is the negative of the y-intercept. Since the y-intercept is negative, the work function is positive.
     
  6. Sep 22, 2011 #5
    I got it now Doc Al. Thank you so much
     
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