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Homework Help: Determine Planck's Constant from gradient

  1. Sep 21, 2012 #1
    1. The problem statement, all variables and given/known data

    Determine Planck's Constant from gradient

    2. Relevant equations

    3. The attempt at a solution

    I have a graph entitled "Photoelectric effect: stopping voltage as a function of light frequency"

    The y-axis is the Stopping Voltage (V), the x-axis the Frequency (Hz).

    How do I determine Planck's Constant (h) from the gradient?

  2. jcsd
  3. Sep 21, 2012 #2
    What is the kinetic energy of a photo-emitted electron?
  4. Sep 22, 2012 #3


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Why is your "Relevant equations" section blank? It is a photoelectric effect problem, look up the equation that describes the photoelectric effect.
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