Practice question
Question
The work function of a metal is 3.31 × 10⁻¹⁹ J. What is the threshold wavelength in nm? (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹)
Explanation
λ₀ = hc/W₀ = 6.626×10⁻³⁴ × 3.0×10⁸ / 3.31×10⁻¹⁹ = 6.0×10⁻⁷ m = 600 nm.
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