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In a Compton scattering experiment, an incident X-ray photon moving in the -direction scatters from an electron at rest. If after the collision the electron moves in the -direction, what must be the direction of the scattered X-ray photon?

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In a Compton scattering experiment, an incident X-ray photon moving in the -direction scatters from an electron at rest. If after the collision the electron moves in the -direction, what must be the direction of the scattered X-ray photon?
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