Practice question

MCQ

Question

A metal has a work function of 3.2 eV. What is the kinetic energy of an electron ejected by light of wavelength 350 nm? (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹, 1 eV = 1.6 × 10⁻¹⁹ J)

Options

Choose one · Correct answer highlighted

5.6794 × 10⁻¹⁹ J 5.5936 × 10⁻²⁰ J Correct 2.0858 × 10⁻¹⁹ J 3.9756 × 10⁻¹⁹ J

Explanation

E ≈ 3.55 eV. KE ≈ 0.35 eV ≈ 5.59×10⁻²⁰ J.

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