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Homework Help: Energy level

  1. May 10, 2008 #1
    1. The problem statement, all variables and given/known data
    An experiment is performed on a sample of atoms known to have a ground state of -5.0eV. The gas is illuminated with "white light" (400-700 nm). A spectrometer capable of analyzing radiation in this range is used to measure the radiation. The sample is observed to absorb light at only 400 nm. After "the white light" is turned off, the sample is observed to emit visible radiation of 400 nm and 600 nm. Determine the values of the energy levels
    i. the ground state ii. the energy level to which the system was first excited

    3. The attempt at a solution

    I think the question already gave us the ground state, but how do I find the energy level if I don't know which atom it is.
  2. jcsd
  3. May 10, 2008 #2


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    Homework Helper

    Hi MIA6,

    When light of wavelength 400nm is absorbed, what is happening to the individual atoms? There is an energy that corresponds to 400nm; what is that energy and how is that energy related to the energy levels of the atom?
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