An X-ray photon with 30.0 keV of energy is scattered 60.0° by a free electron. (a) What is the energy of the recoiling electron? Give your answer in eV. (b) What is the recoil speed of the electron?

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Q: these are wrong

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Compton effect

The incoming photons' energy must be in the range of an X-ray frequency to generate the Compton effect. The electron does not lose enough energy that reduces the wavelength of scattered photons towards the visible spectrum. As a result, with visible lights, the Compton effect is missing.

Recoil Velocity

The amount of backward thrust or force experienced by a person when he/she shoots a gun in the forward direction is called recoil velocity. This phenomenon always follows the law of conservation of linear momentum.