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Homework Help: Fermi-Dirac: Density of electrons

  1. May 14, 2014 #1
    1. The problem statement, all variables and given/known data

    Monovalent copper (one conduction electron per atom) has a density of 9000 kg m-3 and atomic mass of 64 amu (ie. 1 kmole = 64kg). Find:

    a)The density of conduction electrons per unit volume

    b)the Fermi energy in electron volts

    2. Relevant equations

    f(E) = 1/(e(E-EF)/KT+1)


    3. The attempt at a solution

    So this is the first problem I've done on Fermi-Dirac so I'm a bit stuck here.

    So I got the volume from V=m/ρ, so:


    Is this even relevant to the question? Really lost and any help would be much appreciated
  2. jcsd
  3. May 14, 2014 #2
    I think I have to use the formula n=DNA/m


    NA=Avogadros No. = 6.02x1023 mol-1
    D=Density=9000 kg m-3=9000000 g m-3
    m=64 amu= g mol-1

    I used the formula to get n=(9000000)(6.02x1023)/64=8.4375x1028 m-3

    Is this the answer for part a)?
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