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,

genius_generous answered 2 years ago
Next > < Previous

Related Solutions

Assume Silicon (bandgap 1.12 eV) at room temperature (300 K) with the Fermi level located exactly...
Assume Silicon (bandgap 1.12 eV) at room temperature (300 K) with the Fermi level located exactly in the middle of the bandgap. Answer the following questions. a) What is the probability that a state located at the bottom of the conduction band is filled? b) What is the probability that a state located at the top of the valence band is empty?
The Fermi energy for copper is EF = 7.00 eV. For copper at T = 1030...
The Fermi energy for copper is EF = 7.00 eV. For copper at T = 1030 K, (a) find the energy of the energy level whose probability of being occupied by an electron is 0.933. For this energy, evaluate (b) the density of states N(E) and (c) the density of occupied states No(E).
The fermi energy of silver is given as 5.49 eV. a) Find the densities of electron...
The fermi energy of silver is given as 5.49 eV. a) Find the densities of electron and atom per volume. b) Find the fermi velocity of electron in silver c) The current value flowing through silver is 2 A. The cross sectional area of silver is 0.5 cm2 . Find the drift velocity of electron in silver according to given conditions. d)Find the collision time T for an electron for sliver. (the definition of current density is the current per...
The fermi energy of silver is given as 5.49 eV. a) Find the densities of electron...
The fermi energy of silver is given as 5.49 eV. a) Find the densities of electron and atom per volume. b) Find the fermi velocity of electron in silver c) The current value flowing through silver is 2 A. The cross sectional area of silver is 0.5 cm2. Find the drift velocity of electron in silver according to given conditions. d)Find the collision time  for an electron for sliver. (the definition of current density is the current per cross...
The fermi energy of silver is given as 5.49 eV. a) Find the densities of electron...
The fermi energy of silver is given as 5.49 eV. a) Find the densities of electron and atom per volume. b) Find the fermi velocity of electron in silver c) The current value flowing through silver is 2 A. The cross sectional area of silver is 0.5 cm2. Find the drift velocity of electron in silver according to given conditions. d)Find the collision time  for an electron for sliver. (the definition of current density is the current per cross...
Doping changes the Fermi energy of a semiconductor. Consider silicon, with a gap of 1.11 eV...
Doping changes the Fermi energy of a semiconductor. Consider silicon, with a gap of 1.11 eV between the top of the valence band and the bottom of the conduction band. At 300 K the Fermi level of the pure material is nearly at the midpoint of the gap. Suppose that silicon is doped with donor atoms, each of which has a state 0.13 eV below the bottom of the silicon conduction band, and suppose further that doping raises the Fermi...
A simple insulator has a band gap of 4.0 eV, and the Fermi energy may be...
A simple insulator has a band gap of 4.0 eV, and the Fermi energy may be taken to reside in the middle of the gap. Estimate the probability of an electron at room temperature being in the conduction band.
The electrical conductivity and the electron mobility for copper at room temperature are 6.0 X 107...
The electrical conductivity and the electron mobility for copper at room temperature are 6.0 X 107 (W.m)-1 and 0.003 m2/V-s, respectively. Compute the number of free electrons per copper atom.
3) For the case of 4% Al in Cu, why does the room temperature strength not...
3) For the case of 4% Al in Cu, why does the room temperature strength not decrease, while the hot aged samples show the increase then decrease in strength with time. Be sure to measure crystal structure and phase boundaries ? Please type your answer!!! Thanks
What is the pH of a 3.4x10-8 M HClO4 solution at room temperature? A.7.1 B.7.0 C.5.3...
What is the pH of a 3.4x10-8 M HClO4 solution at room temperature? A.7.1 B.7.0 C.5.3 D.6.9
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT