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1• a) The electrical conductivity of monovalent Na metal is 2.17×10⁷ Ω⁻¹m⁻¹. Calculate the relaxation time and the drift velocity in a field of 100 V m⁻¹ . Take density of Na to be 0.97 gm cm⁻³ . b) A square lattice has a side of 3.2 Å. Calculate the momentum and energy of an electron whose wave terminates at the boundary of the first Brillouin zone.
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