(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

ques 1what is de-Broglie wavelength of a He-atom in a container at room temperature.

ques 2calculate the number of exchange pairs of electrons present in configuration of Cu according to Aufbau Principle including d and s electrons.

ques 3He atom can excited to 1s^{1}2p^{2}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 = -13.6z^{2}/n^{2}

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

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

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