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Homework Help: Kinetic energy of electrons

  1. Apr 6, 2016 #1
    1. The problem statement, all variables and given/known data

    A sample of hydrogen atoms is irradiated with light with wavelength 85.5 nm, and electrons are observed leaving the gas.

    (a) If each hydrogen atom were initially in its ground level, what would be the maximum kinetic energy in electron volts of these photoelectrons? 0.9 eV
    (b) A few electrons are detected with energies as much as 10.2 eV greater than the maximum kinetic energy calculated in part (a). How can this be?

    2. Relevant equations

    3. The attempt at a solution

    For the answer of part (b) Is it correct to say that it's caused by the uncertainty in the Energy of the electrons?

    Last edited: Apr 6, 2016
  2. jcsd
  3. Apr 6, 2016 #2


    User Avatar

    Staff: Mentor

    Think about what a gas is. Are all the atoms fixed in place and at rest?
  4. Apr 6, 2016 #3
    hehe, I just realized it. Thank you.
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