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(a) Derive the density of states g (8)615 for a two-dimensional crystal. Show your work. (b) An electromagnetic eld is applied to the crystal, and

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(a) Derive the density of states g (8)615 for a two-dimensional crystal. Show your work. (b) An electromagnetic eld is applied to the crystal, and the total absorption probability over all frequencies is measured. How do you expect the absorption probability to depend on the energy of the electrons in the crystal, Within a band

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