A monochromatic light beam with λ=450 nm is incident on a metallic cathode, ripping away electrons that are moving away with speed 7.0x10^{5}m/s. What wavelength of light must we shine on the cathode so that the stripped electrons have a speed of 5.0x10^{5}m/s?
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 monochromatic light beam with λ=450 nm is incident on a metallic cathode, ripping away electrons that are moving away with speed 7.0x10^{5}m/s.
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