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Photoelectric Effect difficulties

  1. May 18, 2010 #1
    1. The problem statement, all variables and given/known data
    "The threshold frequency of a particular metal surface is 5.6 × 1014 Hz. Calculate the maximum kinetic energy of emitted electrons if the frequency of the light striking the metal surface is double the threshold frequency."
    Taken from AQA Physics Exam 2009
    2. Relevant equations
    E=hv, W=hFo

    3. The attempt at a solution
    I tried working out double the threshhold freq. and then going into finding the KEmax from there. Got Really confuzed... :(
  2. jcsd
  3. May 18, 2010 #2

    Andrew Mason

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    Assume the photon with double the threshold frequency gives all its energy to the electron. How much is used in freeing the electron from the surface? What happens to the rest of the energy?

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