What Is Kinetic Energy of an Electron Ejected from a Sodium

question 38

Short Answer

What is kinetic energy of an electron ejected from a sodium surface, whose work function is E_A = 2.28 eV, when it is illuminated with light of frequency f = 1.88 × 10¹⁵ Hz?
[h = 6.63 × 10^-34 J s, c = 3 × 10⁸ m/s, 1 eV = 1.6 × 10^-19 J]

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