Practice question
Question
A metal has a work function of 2.8 eV. What is the threshold wavelength? (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹, 1 eV = 1.6 × 10⁻¹⁹ J)
Explanation
λ₀ = hc/W₀ ≈ 443.7 nm.
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