7.3 Revaluate the absorption length in GaAs now for an X-ray energy of 15 keV, and explain why it is shorter than at 10 keV. (Ga: $\mu/\rho_m$(15 keV) = 85.37 cm$^2$/g; As: $\mu/\rho_m$(15 keV) = 98.56 cm$^2$/g)
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