Question:

give answer in 2 step with explanation at the end of each step and final answer at the end: 4. Copper Oxide Layers The common building blocks for most high temperature (high Tc) su perconductors are copper oxide layers as shown in the figure below. Assume the distance between the copper atoms (dark circles) is a. For simplicity assume that in the third dimension these CuO2 layers are simply stacked ( copper above copper, oxygen above oxygen) with spacing c, and there are no other atoms in the crystal structure. In first approximation, the layers have four -fold symmetry; the crystal is tetragonal. 0.0.0.0 0.0. 0.0. (i) tetragonal (ii) orthorhombic (a) Sketch the Bravais lattice and indicate a possible set of primitive lattice vectors. What is the unit cell, and what is the basis? (b) In La2CuO4 one discovers at closer inspection, that the CuO2 lattice is actually not flat; but that the oxygen atoms are moved out of the plane ( up or down) in an alternating fashion (see the figure above where + means up and means down. What is the primitive cell and lattice spacing for this crystal ? What is the reciprocal lattice ?Afirm purchased equipment four years ago at a cost of $218,000. The equipment s reported on today's balance sheet at a net value of $97,400 but could actually be sold for $92,900. This is the only fixed asset the firm owns. Net working capital is $41,300 and long-term debt is $102,800. Whats the book value of shareholders’ equity? Multiple Choice O se & ©) samo (OO) 900 (O) s29400