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5. (a) Comment on the achievements and failures of the Free Electron model. (b) Defin

e Fermi Dirac distribution and density of energy states.

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1. (a) Compute the concentration of holes and electrons in an intrinsic sample of Si at room temperature. You may take me = 0.7m and mh = m. (b) Determine the position of the Fermi level under these conditions.
Pls help ASAP. Pls show all work and do all parts of the question.
Pls explain in a few sentences.
Pls help ASAP
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(a) Describe the free electron gas model of metals. How does it help to explain the lattice heat capacity and electrical conductivity of metals?
2) An atomic nucleus can be crudely modeled as a gas of nucleons with a number density of 0.09 fm-3 (where 1 fm = 10-15m). a) Calculate the Fermi energy ɛp of this system. b) Also, calculate the Fermi temperature TF. Is it reasonable to treat the nucleus as a degenerate Fermi gas at room temperature? c) Calculate the degeneracy pressure of the nucleus. What keeps the nucleus from blowing apart due to this degeneracy pressure?
Explain why the free electron model is unable to explain material systems which has an energy gap! Then, what model/theory can explain the system by energy gap?
The function F(E) shown here is 10 E-Ho 0 KT -10 0.5 → F(E) a. the Fermi function, fo(E) Ob. 1 - fo(E) Oc. 1 + fo(E) Od. kT Ofo/OE Oe.- KTOfo/OE
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