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Fermi Dirac: Chance of finding valence electron outside aluminium foil?

Got a problem with the following:Aluminium foilt Thickness 1.5mmEf Fermi energy 11.6 eVT 300KP density 2.70 kg/m^3M Molar mass 27 g/moleW Work function 4.1 eVCalculate the chance of finding valance electrons outside the foil using Fermi - Dirac.The only fermi-dirac formula I can use is F(E) 1 / (e^((E-Ef)/kT)+1)What do I have to use for E?Thanks a lot!

Answer:

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