Practice portal › Dual Nature of Matter and Radiation › Stopping Potential and Threshold Frequency
Asked in GSEB Board March 2020 · What the stopping potential depends on
Idea: for the fastest photoelectron, Einstein's equation gives eV₀ = Kₘₐₓ = hf - φ₀.
For a given metal the work function φ₀ is fixed, so V₀ = h/ef - (φ₀)/e depends only on f.
Intensity changes only the number of photons per second, and hence the current, not V₀.
So the stopping potential depends on the frequency of the incident light.
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