Practice question
Question
The work function of a metal is 2.5 eV. What is the maximum wavelength of light that can eject electrons from this metal? (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹, 1 eV = 1.6 × 10⁻¹⁹ J)
Explanation
W₀ = 4.0×10⁻¹⁹ J. λmax = hc/W₀ ≈ 4.97×10⁻⁷ m = 497 nm.
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