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Monochromatic light from laser shines onto an aluminium surface and produces photoelectrons with maximum kinetic energy...

Monochromatic light from laser shines onto an aluminium surface and produces photoelectrons with maximum kinetic energy KEmax = 1.02 eV. What is the wavelength of the laser light? What is the maximum velocity of the photoelectrons? Assume a work function of 4.06 eV for aluminium.

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