A metal alloy has a work function of (E_{0}=4.6 times 10^{-19} mathrm{~J}). It is irradiated with light

Question:

A metal alloy has a work function of $E_{0}=4.6 \times 10^{-19} \mathrm{~J}$. It is irradiated with light of different wavelengths, and the maximum kinetic energy of ejected electrons is measured. What are the maximum kinetic energy and the maximum electron speed (a) when 390-nm light is used and $(b)$ when $750-\mathrm{nm}$ light is used?

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