Classic theory predicts that the output frequency must be the same as the input one since the electromagnetic wave makes the electron vibrate with same frequency as itself, which then irradiates further waves.
The formula is exactly that of two relativistic billiard balls colliding.
Therefore this is evidence that photons exist and have momentum.
Video 1. Compton Scattering by Compton Scattering (2017) Source. Experiment with a caesium-137 source.
Video 2. L3.3 Compton Scattering by Barton Zwiebach (2017) Source.

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