The visible spectrum of electromagnetic wave approximately which spans between 300 nm to 800 nm falls on a metallic surface The

Question

The visible spectrum of electromagnetic wave approximately which spans between 300 nm to 800 nm falls on a metallic surface The work function for this metallic surface is 2 40 eV Find the followings a The spectral range that will successfully eject photoelectrons from the metallic surface b The speed of the ejected electrons

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