Practice portal › Dual Nature of Matter and Radiation › Stopping Potential and Threshold Frequency

For a given frequency of incident radiation, the stopping potential ______.

Asked in GSEB Board July 2021 · What the stopping potential depends on

• (1) does not depend on intensity
• (2) is inversely proportional to intensity
• (3) is directly proportional to intensity
• (4) is inversely proportional to the square of intensity

Step-by-step solution

Why the other options are wrong

• (2) Raising the intensity sends more photons per second, so more electrons are emitted and the saturation current rises, but each photon still has the same energy h u. The stopping potential does not fall.
• (3) More intense light means more photons, not more energetic ones. Each electron still receives one photon of energy h u, so Kₘₐₓ, and with it V₀, stays the same.
• (4) There is no inverse-square link: eV₀ = h u - φ₀ contains no intensity term at all.

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