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Potassium chloride (KCL) crystal with a unit cell parameter of 6.3 A. The potassium
and chlorine atomic weights are 39 a.m.u and 37 a.m.u, respectively. The young's
modulus of elasticity is 2.967x100 N/m². Calculate the following:
a- The maximum value of the optical branch frequency.
b- The corresponding wavelength.

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