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Question

The work function of a metal is 2.0 eV. What is the maximum kinetic energy of an electron ejected by light of wavelength 400 nm? (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹, 1 eV = 1.6 × 10⁻¹⁹ J)

Options

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Explanation

E ≈ 3.105 eV. KEmax = 1.105 eV ≈ 1.768×10⁻¹⁹ J.