1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted