4. Discuss briefly the origin of the differing electronic properties of metals, semiconductors and insulators. Under what circumstances will the nearly-free electron model be useful for describing the band structure of a solid?
A weak periodic potential
W(z) = W_0 cos (2*pi*z)/a
with W_0 > 0, is imposed on a one-dimensional free-electron gas lying along the z direction. Discuss the form of the resulting wavefunctions at the first Brillouin zone boundary. Explain why a gap arises.
A simple model of a two-dimensional band structure can be obtained by summing together two one-dimentional band structures. Consider the energy band
E(k_x, k_y) = U cos (k_x * a) - U cos (k_y * a)
with U > 0, corresponding to a particular two-dimensional crystal with square lattice and period a. Give the wavevectors and energies of the highest and lowest energy states in teh band. Draw labelled constant energy contours in the first Brillouin zone near these particular states. Comment on the form of the constant-energy contours near the centre fo teh first Brillouin zone.© BrainMass Inc. brainmass.com October 25, 2018, 1:10 am ad1c9bdddf
The explanations are in the attached file, and I also attach a pdf file with lecture notes you ...
The explanation is provided in an attached Word document wtih step-by-step reasoning and calculations.
An Analysis of Dish
Why is it best for large organizations like Dish to use both PEST and Porter's 5 Forces analysis in helping its leaders to understand their particular external environment? Make sure you demonstrate understanding of both analytical processes in your discussion and give clear, Dish-related examples to support your arguments.
Second, describe how the information obtained from the organization's macro-level external analysis might be used by an organization like Dish in performing their SWOT analysis.
In short, what should an organization like Dish be doing to analyze the external environment at the macro-level and how does that overlap with the organization's micro-level analysis efforts? Make sure you provide well-reasoned and well supported arguments.
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