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.
A sodium gas-discharge lamp emits a visible "doublet" of two spectral emission lines, one at 589.0nm and the other at 589.6nm.
(a) How many slits/cm are required for a transmission diffraction grating that is 2.5 cm wide to distinctly resolve these two lines at first order (m=1) ?
(b) At second order (m=2) ?
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