a a crystal with a face-centered cubic structure, the basic cell can be ken as a cube of edge a with its center at the origin of coordinates ad its edges parallel to the Cartesian coordinate axes; atoms are sited the eight corners and at the center of each face. However, other asic cells are possible. One is the rhomboid shown in the figure below, hich has three vectors b, č and d as edges. b a

2- Assuming that the oscillating ionic compound is cesium chloride, if you know the atomic weight of chlorine is 35.5 gm/mol and the atomic weight of cesium is 133 gm/mol, and assuming that Hooke's constant is y=4N/m²? NA = 6.02 x 1023 mol-¹ 1. Calculate the maximum frequency of the optical branch? 2. Calculate the frequency of the optical and acoustic branch at the boundary? 3. Determine the range of the forbidden frequency region? 4. Determine the Debye Temperature? 5. If you know that the lattice constant a = 3.14 Å, draw the first Brillion zone curve with its optical and acoustic branches. 6. If you know that the two atoms have the same mass equal to the mass of the smaller atom, then repeat the previous calculations and redraw the differentiation curve?

. How are we able to determine the chemical composition and temperature of any visible object? ite often advertisements appear for telescopes that extol their aluating telescopes? enifvi

2. The emission spectrum for sodium below shows two bright lines at frequency 1(f ) and frequency 2(f ). The difference in energy between Frequency 1 and Frequency 2 can be determined with what formula using the frequencies (f and f ) and Planck’s constant (h)? answer choices are in the images attached!!