A photon with wavelength l1 is scattered by a moving free electron. As a result, the electron stopped, and the photon with wavelength l0 deviated from the direction of motion of the original photon by an angle Q=60°. The scattered photon experienced new scattering by another stationary free electron. As a result of the last scattering, the photon with wavelength Lf=1.25•10-10m deviated from the direction of motion of the photon with wavelength again by an angle Q=60°. Determine the de Broglie wavelength of the electron that interacted with the original photon. The following quantities are known: Planck's constant h=6.6•10-34 J•s, electron rest mass m0=9.1•10-31 kg, speed of light c=3.0•108 m/s.
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