A metal has a work function of 2.5 eV. What is the threshold wavelength? (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹, 1

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A metal has a work function of 2.5 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)

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620.5 nm 354.2 nm 443.7 nm 496.95 nm Correct

λ₀ = hc/W₀ ≈ 497 nm.

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