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The slope of the graph of the stopping potential (V₀) → frequency (u) for the photoelectric effect is equal to ______.

Asked in GSEB Board March 2022 · Stopping potential and kinetic energy graphs

Figure: Stopping potential and kinetic energy graphs
Answer: (2) h/e

Step-by-step solution

Given: V₀ on the Y-axis, u on the X-axis.

Idea: Kₘₐₓ = h u - φ₀ and Kₘₐₓ = eV₀.

So V₀ = h/e u - (φ₀)/e -- a straight line.

Its slope (Δ V₀)/(Δ u) = h/e, a universal constant that is identical for all metals.

So the slope equals h/e.

Why the other options are wrong

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