The stopping-potential versus frequency graph for a metal is shown. The work function of the metal is: Image
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The stopping-potential versus frequency graph for a metal is shown. The work function of the metal is: Image

G1 Physics · Accepted Answer

From the graph, the threshold frequency is approximately ν₀ = 5×10¹⁴ Hz Work function: ϕ = hν₀ = (6.6×10⁻³⁴)(5×10¹⁴) = 3.3×10⁻¹⁹ J Converting to electron-volts: ϕ = (3.3×10⁻¹⁹)/(1.6×10⁻¹⁹) ≈ 2.07 eV Hence option A follows.