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The lattice constant for KCl is 6.292 Å and the Young’s modulus in the [100] direction is 3.2×10¹⁰ Nm⁻² Calculate the force constant and the frequency at which electromagnetic radiation is strongly reflected by the KCl crystal. The atomic weights of K and Cl are 39 amu and 37 amu respectively. (Take 1 amu 1.67 10 kg).
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