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Homework Help: Can some please help in solving these quantum mechanics problems

  1. Jul 13, 2012 #1
    1. The problem statement, all variables and given/known data

    ques 1 what is de-Broglie wavelength of a He-atom in a container at room temperature.
    ques 2 calculate the number of exchange pairs of electrons present in configuration of Cu according to Aufbau Principle including d and s electrons.
    ques 3 He atom can excited to 1s12p2 by λ = 58.44nm. If lowest excited state for He lies 4857cm- below the above. We need to calculate the energy for the lower excitation state.

    2. Relevant equations

    in the first question we can use de-Broglie wavelength,λ=h/mv but the problem is in finding the room temperature. is there any relation in finding velocity of an atom and temperature?
    in third question we can use wavenumber = 1/λ, energy at nth orbit = -13.6z2/n2

    3. The attempt at a solution

    i have no idea how to solve question-2. is there any formula for calculating exchange pairs? and what actually is a exchange pair? please help me out
  2. jcsd
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