The spacing between planes of atoms in Crystal ABC was found to be 1.28Å, using an X- rays wavelength of 1.22Å. Assuming second order diffraction. What should be the angle at which the X-rays will be reflected across the ?surface of the crystal

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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.