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Homework Help: Calculating wavelength of light

  1. Oct 9, 2007 #1
    1. The problem statement, all variables and given/known data
    It takes 208.4 kJ of energy to remove 1 mole of electrons from an atom on the surface of rubidium metal.
    What is the maximum wavelength of light capable of doing this?

    2. Relevant equations

    3. The attempt at a solution
    I don't know the energy of the photon. I know h=6.626e-34, c=2.9979e8
    I'm trying to find lambda but w/o the Ephoton I don't how to solve the equation.I found the energy to remove a single electron which is 3.461e-19.
  2. jcsd
  3. Oct 9, 2007 #2


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    Homework Helper

    If you assume that the 208.4kJ was from identical wavelength photons of just the minimum energy to remove the electron, you could work out the energy per photon then use E = hc/lambda to work out the wavelength.
  4. Oct 9, 2007 #3
    Thank You, I was using the wrong energy.
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