4.7 Consider the anomalous scattering of x-rays using the classical model of Sect. 4.2.1. Near the K-edge of Cu (9 keV), two electrons are near resonant excita- tion and 27 are not. The 27 are driven at a frequency above resonance, but the two Is electrons have a change in phase as the x-ray energy approaches 9 keV. Use ( 4.37) and (4.38) with the ratio B = 0.150, to answer this question. Here E ph =