Practice question
Question
The kinetic energy of a photoelectron is 1.5 × 10⁻¹⁹ J when light of wavelength 400 nm is used. What is the work function? (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹)
Explanation
E = hc/λ ≈ 4.970×10⁻¹⁹ J. W₀ = E - KE ≈ 3.470×10⁻¹⁹ J.
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