silica has an fictive temperature of 1400 k with an isothermal compressibility of 7×10^-11 m^2 n ^-1 . the refractive index and the photoelastic coefficient for silica are 1.46 and 0.286 respectively. determine the theoretical attenuation in decibels per kilometer due to the fundamental rayleigh scattering in silica at optical wavelengths of 0.63,1.00, and 1.30 micrometers. boltzmann's constant is 1.381×10^-21 j k ^-1.
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