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A metal alloy has a work function of E0 = 4.2 × 10?19 J. It is...

A metal alloy has a work function of E0 = 4.2 × 10?19 J. It is irradiated with light of different wavelengths, and the maximum kinetic energy of ejected electrons is measured. Part A: What is the maximum kinetic energy of ejected electron when 390-nm light is used? Part B:vWhat is the maximum electron speed when 390-nm light is used? Part C: Does 750-nm light have enough energy to eject an electron from the metal?

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