A 25.0-pm x-ray photon scatters off a free electron at A (Fig. P27.26), producing a photon of wavelength A' traveling at an angle 0 = 40.0° relative to the first photon's direction. This second photon scatters off another free electron at B, produc- ing a photon with wavelength A" and moving in a direction directly opposite the first photon. Determine the wavelengths (a) A' and (b) A". Electron 1 A" Electron 2 Figure P27.26

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