Question: In the SLAC linear accelerator electrons were accelerated up to the energy E el = 20 GeV. To produce a high-energy photon beam a LASER

In the SLAC linear accelerator electrons were accelerated up to the energy E_el = 20 GeV. To produce a high-energy photon beam a LASER beam was back scattered at 180° by the electron beam. Assuming the LASER wavelength λ = 694 nm, what was the scattered photon energy?

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