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A potassium surface is illuminated by a monochromatic laser light with a wavelength of 400 nm....

A potassium surface is illuminated by a monochromatic laser light with a wavelength of 400 nm. Determine the maximum speed of a photoelectron emitted from this surface if the potassium surface has a work function of 2.30 eV.

??=9.11×10^−31??

c = 3.0x10^8 m/s

h = 6.63x10^-34 js

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