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a) A monochromatic x-ray beam gives diffraction of a 18 °C degree cubic crystal at an...

a) A monochromatic x-ray beam gives diffraction of a 18 °C degree cubic crystal at an angle of 2θ = 150.8 °. When the same experiment is repeated at a temperature of 318 degrees, the diffraction angle is 141.6 °. What is the linear expansion coefficient of this crystal? Calculate.
b) Find the lattice vectors and the angles between the lattice vectors of conventional and primitive unit cells for surface centered cubic (FCC) lattice. Find the volume of the unit cells and obtain the ratio of the volume of the conventional cell to the volume of the primitive cell. Find out if your result is correct.

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