final exam – written part - École Polytechnique de Montréal
final exam – written part - École Polytechnique de Montréal
final exam – written part - École Polytechnique de Montréal
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QUESTION 8 :<br />
CONSTANTES UTILES :<br />
= 1.054 x 10 -34 J.s<br />
m e = 9.1 x 10 -31 kg<br />
q = 1.6 x 10 -19 C<br />
N<br />
23<br />
6.02 10 at<br />
1<br />
mol<br />
A<br />
-1<br />
Gold (Au) (atomic mass196.97 g mol ) is a monovalent metal which solidifies in a face centered cubic<br />
structure, with a <strong>de</strong>nsity of<br />
-3<br />
19.3 g cm .<br />
(1) Estimate the average separation R between an electron and a metal ion in the solid, and<br />
(2) the mean distance d between electrons.<br />
(3) Determine the mean free path ( ) of electrons at 273K if the resistivity (Au) = 22.8 n m à 0 C . Give<br />
the value of in nm.<br />
(4) Estimate <strong>de</strong> value of at 273 C .<br />
In all cases, clearly show your work and your assumptions.<br />
Examen général <strong>de</strong> synthèse - Partie écrite<br />
Vendredi 16 juin 2006<br />
Page 11 sur 11<br />
Dé<strong>part</strong>ement <strong>de</strong> génie physique
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