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Ultraviolet light of wavelength 350 nm is directed at a potassiums surface. The work function of...

Ultraviolet light of wavelength 350 nm is directed at a potassiums surface. The work function of potassiums is 2.2 eV.

a) Calculate the maximum energy of photoelectrons in units of eV.

b) Explain why x-ray is not used in the photoelectric effect.
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