Practice portal › Dual Nature of Matter and Radiation › Einstein's Photoelectric Equation and Work Function
Asked in GUJCET 2020 · Work function and the photoelectric equation
Given: threshold frequency f₀ = 5.16×10¹⁴ Hz; take h = 6.63×10⁻³⁴ J s.
Idea: at threshold the photon energy just equals the work function, W = hf₀.
W = 6.63×10⁻³⁴×5.16×10¹⁴ = 3.42×10⁻¹⁹ J
W = (3.42×10⁻¹⁹)/(1.6×10⁻¹⁹) = 2.14 eV
So the work function of caesium is 2.14 eV.
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