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In Compton scattering the wavelength shift is Δλ=λC(1cosθ)\Delta\lambda = \lambda_C(1 - \cos\theta), where λC=2.426×1012\lambda_C = 2.426\times 10^{-12} m is the electron Compton wavelength. For scattering at θ=90\theta = 90 degrees, what is Δλ\Delta\lambda in meters?