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?

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?

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