A spacer is cut from a playing card of thickness 2.82 ✕ 10−4 m and used to separate one end of two rectangular, optically flat, 3.10 cm long glass plates with n = 1.65, as in the figure below. Laser light at 594 nm shines straight down on the top plate.   Two plates lie one on top of the other. They touch each other at the right end, and are separated by a small circle at the left end. Three arrows point vertically downward toward the top plate. (a) Count the number of phase reversals for the interfering waves.   (b) Calculate the separation (in m) between dark interference bands observed on the top plate. m

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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.