Question
In: Physics
The Fermi energy for Cu is 7.0 eV and its conductivity at room temperature is measured...
The Fermi energy for Cu is 7.0 eV and its conductivity at room temperature is measured to be sigma = 5.9x10^7 omega ^-1 m^-1 a.(5 pts) What is the Fermi speed, in absolute units and as a fraction of the speed of light?b.(5 pts) What is the mean free path?
Solutions
Expert Solution
Solution
Given, 
The Fermi speed, 
m= mass of an electron = 9.11 x 10-31 kg
Speed of light, 
Let , 
, where a is a constant.
The mean free path, d of an electron in copper can be calculated from
electron density of copper, 
where, avogadro number 
density of copper, 
atomic mass of copper, 
So we will get, 
And mean free path, 
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