30) The Fermi energy (Er) of electrons in copper at room temperature is 7.0 eV. The electron drift mobility in copper, from Hall effect measurements, is 33 cm² V1 s'ª. a) What is the speed (vi) of conduction electrons with energies around Er in copper? How does this compare with the average thermal speed if they behaved like an ideal gas? Why might these be different? (Hint: Eth =KT) b) What is the De Broglie wavelength of these electrons? Will the electrons get diffracted by the lattice planes in copper, given that separation between the planes of a copper crystal is d = 2.09 Å.
30) The Fermi energy (Er) of electrons in copper at room temperature is 7.0 eV. The electron drift mobility in copper, from Hall effect measurements, is 33 cm² V1 s'ª. a) What is the speed (vi) of conduction electrons with energies around Er in copper? How does this compare with the average thermal speed if they behaved like an ideal gas? Why might these be different? (Hint: Eth =KT) b) What is the De Broglie wavelength of these electrons? Will the electrons get diffracted by the lattice planes in copper, given that separation between the planes of a copper crystal is d = 2.09 Å.
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Transcribed Image Text:30) The Fermi energy (E:) of electrons in copper at room temperature is 7.0 eV. The electron drift
mobility in copper, from Hall effect measurements, is 33 cm? V1s1.
a) What is the speed (v:) of conduction electrons with energies around Er in copper? How
does this compare with the average thermal speed if they behaved like an ideal gas? Why
might these be different? (Hint: Etn =kT)
b) What is the De Broglie wavelength of these electrons? Will the electrons get diffracted by
the lattice planes in copper, given that separation between the planes of a copper crystal
is d = 2.09 Å.
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