A photon with a wavelength of 4.00 × 10-¹2 m strikes a free electron at rest. During the collision the photon wavelength changes by half a Compton wavelength 1.214 × 10-¹² m. The angle of the scattered photon with respect to the direction of the incident photon is 30 degrees 60 degrees

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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.