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The unit cell parameter of NaCl crystal is 5.6 A° and the modulus of elasticity along
(100) direction is 5x1010 N/m?. Estimate the wavelength at which an electromagnetic
radiation is strongly reflected by the crystąl. (At. Wt. of Na - 23 and of Cl = 37)
(1 a.m.u = 1.67x102"Kg)
(c)

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