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Question: hi need help with this physical chemistry question please show...

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5. It is observed experimentally that when light of wavelength longer than 564 nm shines a surface of potassium metal, no electrons are ejected from the metal. (a) What is the work function of potassium in eV? (b) What is the speed of the ejected electrons when light with a wavelength of 380 nm is used? (c) What is the de Broglie wavelength of these ejected electrons?Hi! Need help with this physical chemistry question. Please show work and thanks so much!!

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